/*!
 * Vue.js v2.6.10
 * (c) 2014-2019 Evan You
 * Released under the MIT License.
 */
'use strict';

/*  */

var emptyObject = Object.freeze({});

// These helpers produce better VM code in JS engines due to their
// explicitness and function inlining.
function isUndef (v) {
    return v === undefined || v === null
}

function isDef (v) {
    return v !== undefined && v !== null
}

function isTrue (v) {
    return v === true
}

function isFalse (v) {
    return v === false
}

/**
 * Check if value is primitive.
 */
function isPrimitive (value) {
    return (
        typeof value === 'string' ||
        typeof value === 'number' ||
        // $flow-disable-line
        typeof value === 'symbol' ||
        typeof value === 'boolean'
    )
}

/**
 * Quick object check - this is primarily used to tell
 * Objects from primitive values when we know the value
 * is a JSON-compliant type.
 */
function isObject (obj) {
    return obj !== null && typeof obj === 'object'
}

/**
 * Get the raw type string of a value, e.g., [object Object].
 */
var _toString = Object.prototype.toString;

function toRawType (value) {
    return _toString.call(value).slice(8, -1)
}

/**
 * Strict object type check. Only returns true
 * for plain JavaScript objects.
 */
function isPlainObject (obj) {
    return _toString.call(obj) === '[object Object]'
}

function isRegExp (v) {
    return _toString.call(v) === '[object RegExp]'
}

/**
 * Check if val is a valid array index.
 */
function isValidArrayIndex (val) {
    var n = parseFloat(String(val));
    return n >= 0 && Math.floor(n) === n && isFinite(val)
}

function isPromise (val) {
    return (
        isDef(val) &&
        typeof val.then === 'function' &&
        typeof val.catch === 'function'
    )
}

/**
 * Convert a value to a string that is actually rendered.
 */
function toString (val) {
    return val == null
        ? ''
        : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
            ? JSON.stringify(val, null, 2)
            : String(val)
}

/**
 * Convert an input value to a number for persistence.
 * If the conversion fails, return original string.
 */
function toNumber (val) {
    var n = parseFloat(val);
    return isNaN(n) ? val : n
}

/**
 * Make a map and return a function for checking if a key
 * is in that map.
 */
function makeMap (
    str,
    expectsLowerCase
) {
    var map = Object.create(null);
    var list = str.split(',');
    for (var i = 0; i < list.length; i++) {
        map[list[i]] = true;
    }
    return expectsLowerCase
        ? function (val) { return map[val.toLowerCase()]; }
        : function (val) { return map[val]; }
}

/**
 * Check if a tag is a built-in tag.
 */
var isBuiltInTag = makeMap('slot,component', true);

/**
 * Check if an attribute is a reserved attribute.
 */
var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');

/**
 * Remove an item from an array.
 */
function remove (arr, item) {
    if (arr.length) {
        var index = arr.indexOf(item);
        if (index > -1) {
            return arr.splice(index, 1)
        }
    }
}

/**
 * Check whether an object has the property.
 */
var hasOwnProperty = Object.prototype.hasOwnProperty;
function hasOwn (obj, key) {
    return hasOwnProperty.call(obj, key)
}

/**
 * Create a cached version of a pure function.
 */
function cached (fn) {
    var cache = Object.create(null);
    return (function cachedFn (str) {
        var hit = cache[str];
        return hit || (cache[str] = fn(str))
    })
}

/**
 * Camelize a hyphen-delimited string.
 */
var camelizeRE = /-(\w)/g;
var camelize = cached(function (str) {
    return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
});

/**
 * Capitalize a string.
 */
var capitalize = cached(function (str) {
    return str.charAt(0).toUpperCase() + str.slice(1)
});

/**
 * Hyphenate a camelCase string.
 */
var hyphenateRE = /\B([A-Z])/g;
var hyphenate = cached(function (str) {
    return str.replace(hyphenateRE, '-$1').toLowerCase()
});

/**
 * Simple bind polyfill for environments that do not support it,
 * e.g., PhantomJS 1.x. Technically, we don't need this anymore
 * since native bind is now performant enough in most browsers.
 * But removing it would mean breaking code that was able to run in
 * PhantomJS 1.x, so this must be kept for backward compatibility.
 */

/* istanbul ignore next */
function polyfillBind (fn, ctx) {
    function boundFn (a) {
        var l = arguments.length;
        return l
            ? l > 1
                ? fn.apply(ctx, arguments)
                : fn.call(ctx, a)
            : fn.call(ctx)
    }

    boundFn._length = fn.length;
    return boundFn
}

function nativeBind (fn, ctx) {
    return fn.bind(ctx)
}

var bind = Function.prototype.bind
    ? nativeBind
    : polyfillBind;

/**
 * Convert an Array-like object to a real Array.
 */
function toArray (list, start) {
    start = start || 0;
    var i = list.length - start;
    var ret = new Array(i);
    while (i--) {
        ret[i] = list[i + start];
    }
    return ret
}

/**
 * Mix properties into target object.
 */
function extend (to, _from) {
    for (var key in _from) {
        to[key] = _from[key];
    }
    return to
}

/**
 * Merge an Array of Objects into a single Object.
 */
function toObject (arr) {
    var res = {};
    for (var i = 0; i < arr.length; i++) {
        if (arr[i]) {
            extend(res, arr[i]);
        }
    }
    return res
}

/* eslint-disable no-unused-vars */

/**
 * Perform no operation.
 * Stubbing args to make Flow happy without leaving useless transpiled code
 * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
 */
function noop (a, b, c) {}

/**
 * Always return false.
 */
var no = function (a, b, c) { return false; };

/* eslint-enable no-unused-vars */

/**
 * Return the same value.
 */
var identity = function (_) { return _; };

/**
 * Generate a string containing static keys from compiler modules.
 */
function genStaticKeys (modules) {
    return modules.reduce(function (keys, m) {
        return keys.concat(m.staticKeys || [])
    }, []).join(',')
}

/**
 * Check if two values are loosely equal - that is,
 * if they are plain objects, do they have the same shape?
 */
function looseEqual (a, b) {
    if (a === b) { return true }
    var isObjectA = isObject(a);
    var isObjectB = isObject(b);
    if (isObjectA && isObjectB) {
        try {
            var isArrayA = Array.isArray(a);
            var isArrayB = Array.isArray(b);
            if (isArrayA && isArrayB) {
                return a.length === b.length && a.every(function (e, i) {
                    return looseEqual(e, b[i])
                })
            } else if (a instanceof Date && b instanceof Date) {
                return a.getTime() === b.getTime()
            } else if (!isArrayA && !isArrayB) {
                var keysA = Object.keys(a);
                var keysB = Object.keys(b);
                return keysA.length === keysB.length && keysA.every(function (key) {
                    return looseEqual(a[key], b[key])
                })
            } else {
                /* istanbul ignore next */
                return false
            }
        } catch (e) {
            /* istanbul ignore next */
            return false
        }
    } else if (!isObjectA && !isObjectB) {
        return String(a) === String(b)
    } else {
        return false
    }
}

/**
 * Return the first index at which a loosely equal value can be
 * found in the array (if value is a plain object, the array must
 * contain an object of the same shape), or -1 if it is not present.
 */
function looseIndexOf (arr, val) {
    for (var i = 0; i < arr.length; i++) {
        if (looseEqual(arr[i], val)) { return i }
    }
    return -1
}

/**
 * Ensure a function is called only once.
 */
function once (fn) {
    var called = false;
    return function () {
        if (!called) {
            called = true;
            fn.apply(this, arguments);
        }
    }
}

var SSR_ATTR = 'data-server-rendered';

var ASSET_TYPES = [
    'component',
    'directive',
    'filter'
];

var LIFECYCLE_HOOKS = [
    'beforeCreate',
    'created',
    'beforeMount',
    'mounted',
    'beforeUpdate',
    'updated',
    'beforeDestroy',
    'destroyed',
    'activated',
    'deactivated',
    'errorCaptured',
    'serverPrefetch'
];

/*  */



var config = ({
    /**
     * Option merge strategies (used in core/util/options)
     */
    // $flow-disable-line
    optionMergeStrategies: Object.create(null),

    /**
     * Whether to suppress warnings.
     */
    silent: false,

    /**
     * Show production mode tip message on boot?
     */
    productionTip: "development" !== 'production',

    /**
     * Whether to enable devtools
     */
    devtools: "development" !== 'production',

    /**
     * Whether to record perf
     */
    performance: false,

    /**
     * Error handler for watcher errors
     */
    errorHandler: null,

    /**
     * Warn handler for watcher warns
     */
    warnHandler: null,

    /**
     * Ignore certain custom elements
     */
    ignoredElements: [],

    /**
     * Custom user key aliases for v-on
     */
    // $flow-disable-line
    keyCodes: Object.create(null),

    /**
     * Check if a tag is reserved so that it cannot be registered as a
     * component. This is platform-dependent and may be overwritten.
     */
    isReservedTag: no,

    /**
     * Check if an attribute is reserved so that it cannot be used as a component
     * prop. This is platform-dependent and may be overwritten.
     */
    isReservedAttr: no,

    /**
     * Check if a tag is an unknown element.
     * Platform-dependent.
     */
    isUnknownElement: no,

    /**
     * Get the namespace of an element
     */
    getTagNamespace: noop,

    /**
     * Parse the real tag name for the specific platform.
     */
    parsePlatformTagName: identity,

    /**
     * Check if an attribute must be bound using property, e.g. value
     * Platform-dependent.
     */
    mustUseProp: no,

    /**
     * Perform updates asynchronously. Intended to be used by Vue Test Utils
     * This will significantly reduce performance if set to false.
     */
    async: true,

    /**
     * Exposed for legacy reasons
     */
    _lifecycleHooks: LIFECYCLE_HOOKS
});

/*  */

/**
 * unicode letters used for parsing html tags, component names and property paths.
 * using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
 * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
 */
var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;

/**
 * Check if a string starts with $ or _
 */
function isReserved (str) {
    var c = (str + '').charCodeAt(0);
    return c === 0x24 || c === 0x5F
}

/**
 * Define a property.
 */
function def (obj, key, val, enumerable) {
    Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
    });
}

/**
 * Parse simple path.
 */
var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
function parsePath (path) {
    if (bailRE.test(path)) {
        return
    }
    var segments = path.split('.');
    return function (obj) {
        for (var i = 0; i < segments.length; i++) {
            if (!obj) { return }
            obj = obj[segments[i]];
        }
        return obj
    }
}

/*  */

// can we use __proto__?
var hasProto = '__proto__' in {};

// Browser environment sniffing
var inBrowser = typeof window !== 'undefined';
var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
var UA = inBrowser && window.navigator.userAgent.toLowerCase();
var isIE = UA && /msie|trident/.test(UA);
var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
var isEdge = UA && UA.indexOf('edge/') > 0;
var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
var isPhantomJS = UA && /phantomjs/.test(UA);
var isFF = UA && UA.match(/firefox\/(\d+)/);

// Firefox has a "watch" function on Object.prototype...
var nativeWatch = ({}).watch;

var supportsPassive = false;
if (inBrowser) {
    try {
        var opts = {};
        Object.defineProperty(opts, 'passive', ({
            get: function get () {
                /* istanbul ignore next */
                supportsPassive = true;
            }
        })); // https://github.com/facebook/flow/issues/285
        window.addEventListener('test-passive', null, opts);
    } catch (e) {}
}

// this needs to be lazy-evaled because vue may be required before
// vue-server-renderer can set VUE_ENV
var _isServer;
var isServerRendering = function () {
    if (_isServer === undefined) {
        /* istanbul ignore if */
        if (!inBrowser && !inWeex && typeof global !== 'undefined') {
            // detect presence of vue-server-renderer and avoid
            // Webpack shimming the process
            _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
        } else {
            _isServer = false;
        }
    }
    return _isServer
};

// detect devtools
var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

/* istanbul ignore next */
function isNative (Ctor) {
    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
}

var hasSymbol =
    typeof Symbol !== 'undefined' && isNative(Symbol) &&
    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

var _Set;
/* istanbul ignore if */ // $flow-disable-line
if (typeof Set !== 'undefined' && isNative(Set)) {
    // use native Set when available.
    _Set = Set;
} else {
    // a non-standard Set polyfill that only works with primitive keys.
    _Set = /*@__PURE__*/(function () {
        function Set () {
            this.set = Object.create(null);
        }
        Set.prototype.has = function has (key) {
            return this.set[key] === true
        };
        Set.prototype.add = function add (key) {
            this.set[key] = true;
        };
        Set.prototype.clear = function clear () {
            this.set = Object.create(null);
        };

        return Set;
    }());
}

/*  */

var warn = noop;
var tip = noop;
var generateComponentTrace = (noop); // work around flow check
var formatComponentName = (noop);

{
    var hasConsole = typeof console !== 'undefined';
    var classifyRE = /(?:^|[-_])(\w)/g;
    var classify = function (str) { return str
        .replace(classifyRE, function (c) { return c.toUpperCase(); })
        .replace(/[-_]/g, ''); };

    warn = function (msg, vm) {
        var trace = vm ? generateComponentTrace(vm) : '';

        if (config.warnHandler) {
            config.warnHandler.call(null, msg, vm, trace);
        } else if (hasConsole && (!config.silent)) {
            console.error(("[Vue warn]: " + msg + trace));
        }
    };

    tip = function (msg, vm) {
        if (hasConsole && (!config.silent)) {
            console.warn("[Vue tip]: " + msg + (
                vm ? generateComponentTrace(vm) : ''
            ));
        }
    };

    formatComponentName = function (vm, includeFile) {
        if (vm.$root === vm) {
            return '<Root>'
        }
        var options = typeof vm === 'function' && vm.cid != null
            ? vm.options
            : vm._isVue
                ? vm.$options || vm.constructor.options
                : vm;
        var name = options.name || options._componentTag;
        var file = options.__file;
        if (!name && file) {
            var match = file.match(/([^/\\]+)\.vue$/);
            name = match && match[1];
        }

        return (
            (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
            (file && includeFile !== false ? (" at " + file) : '')
        )
    };

    var repeat = function (str, n) {
        var res = '';
        while (n) {
            if (n % 2 === 1) { res += str; }
            if (n > 1) { str += str; }
            n >>= 1;
        }
        return res
    };

    generateComponentTrace = function (vm) {
        if (vm._isVue && vm.$parent) {
            var tree = [];
            var currentRecursiveSequence = 0;
            while (vm) {
                if (tree.length > 0) {
                    var last = tree[tree.length - 1];
                    if (last.constructor === vm.constructor) {
                        currentRecursiveSequence++;
                        vm = vm.$parent;
                        continue
                    } else if (currentRecursiveSequence > 0) {
                        tree[tree.length - 1] = [last, currentRecursiveSequence];
                        currentRecursiveSequence = 0;
                    }
                }
                tree.push(vm);
                vm = vm.$parent;
            }
            return '\n\nfound in\n\n' + tree
                .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
                    ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
                    : formatComponentName(vm))); })
                .join('\n')
        } else {
            return ("\n\n(found in " + (formatComponentName(vm)) + ")")
        }
    };
}

/*  */

var uid = 0;

/**
 * A dep is an observable that can have multiple
 * directives subscribing to it.
 */
var Dep = function Dep () {
    this.id = uid++;
    this.subs = [];
};

Dep.prototype.addSub = function addSub (sub) {
    this.subs.push(sub);
};

Dep.prototype.removeSub = function removeSub (sub) {
    remove(this.subs, sub);
};

Dep.prototype.depend = function depend () {
    if (Dep.target) {
        Dep.target.addDep(this);
    }
};

Dep.prototype.notify = function notify () {
    // stabilize the subscriber list first
    var subs = this.subs.slice();
    if (!config.async) {
        // subs aren't sorted in scheduler if not running async
        // we need to sort them now to make sure they fire in correct
        // order
        subs.sort(function (a, b) { return a.id - b.id; });
    }
    for (var i = 0, l = subs.length; i < l; i++) {
        subs[i].update();
    }
};

// The current target watcher being evaluated.
// This is globally unique because only one watcher
// can be evaluated at a time.
Dep.target = null;
var targetStack = [];

function pushTarget (target) {
    targetStack.push(target);
    Dep.target = target;
}

function popTarget () {
    targetStack.pop();
    Dep.target = targetStack[targetStack.length - 1];
}

/*  */

var VNode = function VNode (
    tag,
    data,
    children,
    text,
    elm,
    context,
    componentOptions,
    asyncFactory
) {
    this.tag = tag;
    this.data = data;
    this.children = children;
    this.text = text;
    this.elm = elm;
    this.ns = undefined;
    this.context = context;
    this.fnContext = undefined;
    this.fnOptions = undefined;
    this.fnScopeId = undefined;
    this.key = data && data.key;
    this.componentOptions = componentOptions;
    this.componentInstance = undefined;
    this.parent = undefined;
    this.raw = false;
    this.isStatic = false;
    this.isRootInsert = true;
    this.isComment = false;
    this.isCloned = false;
    this.isOnce = false;
    this.asyncFactory = asyncFactory;
    this.asyncMeta = undefined;
    this.isAsyncPlaceholder = false;
};

var prototypeAccessors = { child: { configurable: true } };

// DEPRECATED: alias for componentInstance for backwards compat.
/* istanbul ignore next */
prototypeAccessors.child.get = function () {
    return this.componentInstance
};

Object.defineProperties( VNode.prototype, prototypeAccessors );

var createEmptyVNode = function (text) {
    if ( text === void 0 ) text = '';

    var node = new VNode();
    node.text = text;
    node.isComment = true;
    return node
};

function createTextVNode (val) {
    return new VNode(undefined, undefined, undefined, String(val))
}

// optimized shallow clone
// used for static nodes and slot nodes because they may be reused across
// multiple renders, cloning them avoids errors when DOM manipulations rely
// on their elm reference.
function cloneVNode (vnode) {
    var cloned = new VNode(
        vnode.tag,
        vnode.data,
        // #7975
        // clone children array to avoid mutating original in case of cloning
        // a child.
        vnode.children && vnode.children.slice(),
        vnode.text,
        vnode.elm,
        vnode.context,
        vnode.componentOptions,
        vnode.asyncFactory
    );
    cloned.ns = vnode.ns;
    cloned.isStatic = vnode.isStatic;
    cloned.key = vnode.key;
    cloned.isComment = vnode.isComment;
    cloned.fnContext = vnode.fnContext;
    cloned.fnOptions = vnode.fnOptions;
    cloned.fnScopeId = vnode.fnScopeId;
    cloned.asyncMeta = vnode.asyncMeta;
    cloned.isCloned = true;
    return cloned
}

/*
 * not type checking this file because flow doesn't play well with
 * dynamically accessing methods on Array prototype
 */

var arrayProto = Array.prototype;
var arrayMethods = Object.create(arrayProto);

var methodsToPatch = [
    'push',
    'pop',
    'shift',
    'unshift',
    'splice',
    'sort',
    'reverse'
];

/**
 * Intercept mutating methods and emit events
 */
methodsToPatch.forEach(function (method) {
    // cache original method
    var original = arrayProto[method];
    def(arrayMethods, method, function mutator () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];

        var result = original.apply(this, args);
        var ob = this.__ob__;
        var inserted;
        switch (method) {
            case 'push':
            case 'unshift':
                inserted = args;
                break
            case 'splice':
                inserted = args.slice(2);
                break
        }
        if (inserted) { ob.observeArray(inserted); }
        // notify change
        ob.dep.notify();
        return result
    });
});

/*  */

var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

/**
 * In some cases we may want to disable observation inside a component's
 * update computation.
 */
var shouldObserve = true;

function toggleObserving (value) {
    shouldObserve = value;
}

/**
 * Observer class that is attached to each observed
 * object. Once attached, the observer converts the target
 * object's property keys into getter/setters that
 * collect dependencies and dispatch updates.
 */
var Observer = function Observer (value) {
    this.value = value;
    this.dep = new Dep();
    this.vmCount = 0;
    def(value, '__ob__', this);
    if (Array.isArray(value)) {
        if (hasProto) {
            protoAugment(value, arrayMethods);
        } else {
            copyAugment(value, arrayMethods, arrayKeys);
        }
        this.observeArray(value);
    } else {
        this.walk(value);
    }
};

/**
 * Walk through all properties and convert them into
 * getter/setters. This method should only be called when
 * value type is Object.
 */
Observer.prototype.walk = function walk (obj) {
    var keys = Object.keys(obj);
    for (var i = 0; i < keys.length; i++) {
        defineReactive$$1(obj, keys[i]);
    }
};

/**
 * Observe a list of Array items.
 */
Observer.prototype.observeArray = function observeArray (items) {
    for (var i = 0, l = items.length; i < l; i++) {
        observe(items[i]);
    }
};

// helpers

/**
 * Augment a target Object or Array by intercepting
 * the prototype chain using __proto__
 */
function protoAugment (target, src) {
    /* eslint-disable no-proto */
    target.__proto__ = src;
    /* eslint-enable no-proto */
}

/**
 * Augment a target Object or Array by defining
 * hidden properties.
 */
/* istanbul ignore next */
function copyAugment (target, src, keys) {
    for (var i = 0, l = keys.length; i < l; i++) {
        var key = keys[i];
        def(target, key, src[key]);
    }
}

/**
 * Attempt to create an observer instance for a value,
 * returns the new observer if successfully observed,
 * or the existing observer if the value already has one.
 */
function observe (value, asRootData) {
    if (!isObject(value) || value instanceof VNode) {
        return
    }
    var ob;
    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
        ob = value.__ob__;
    } else if (
        shouldObserve &&
        !isServerRendering() &&
        (Array.isArray(value) || isPlainObject(value)) &&
        Object.isExtensible(value) &&
        !value._isVue
    ) {
        ob = new Observer(value);
    }
    if (asRootData && ob) {
        ob.vmCount++;
    }
    return ob
}

/**
 * Define a reactive property on an Object.
 */
function defineReactive$$1 (
    obj,
    key,
    val,
    customSetter,
    shallow
) {
    var dep = new Dep();

    var property = Object.getOwnPropertyDescriptor(obj, key);
    if (property && property.configurable === false) {
        return
    }

    // cater for pre-defined getter/setters
    var getter = property && property.get;
    var setter = property && property.set;
    if ((!getter || setter) && arguments.length === 2) {
        val = obj[key];
    }

    var childOb = !shallow && observe(val);
    Object.defineProperty(obj, key, {
        enumerable: true,
        configurable: true,
        get: function reactiveGetter () {
            var value = getter ? getter.call(obj) : val;
            if (Dep.target) {
                dep.depend();
                if (childOb) {
                    childOb.dep.depend();
                    if (Array.isArray(value)) {
                        dependArray(value);
                    }
                }
            }
            return value
        },
        set: function reactiveSetter (newVal) {
            var value = getter ? getter.call(obj) : val;
            /* eslint-disable no-self-compare */
            if (newVal === value || (newVal !== newVal && value !== value)) {
                return
            }
            /* eslint-enable no-self-compare */
            if (customSetter) {
                customSetter();
            }
            // #7981: for accessor properties without setter
            if (getter && !setter) { return }
            if (setter) {
                setter.call(obj, newVal);
            } else {
                val = newVal;
            }
            childOb = !shallow && observe(newVal);
            dep.notify();
        }
    });
}

/**
 * Set a property on an object. Adds the new property and
 * triggers change notification if the property doesn't
 * already exist.
 */
function set (target, key, val) {
    if (isUndef(target) || isPrimitive(target)
    ) {
        warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
    }
    if (Array.isArray(target) && isValidArrayIndex(key)) {
        target.length = Math.max(target.length, key);
        target.splice(key, 1, val);
        return val
    }
    if (key in target && !(key in Object.prototype)) {
        target[key] = val;
        return val
    }
    var ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
        warn(
            'Avoid adding reactive properties to a Vue instance or its root $data ' +
            'at runtime - declare it upfront in the data option.'
        );
        return val
    }
    if (!ob) {
        target[key] = val;
        return val
    }
    defineReactive$$1(ob.value, key, val);
    ob.dep.notify();
    return val
}

/**
 * Delete a property and trigger change if necessary.
 */
function del (target, key) {
    if (isUndef(target) || isPrimitive(target)
    ) {
        warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
    }
    if (Array.isArray(target) && isValidArrayIndex(key)) {
        target.splice(key, 1);
        return
    }
    var ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
        warn(
            'Avoid deleting properties on a Vue instance or its root $data ' +
            '- just set it to null.'
        );
        return
    }
    if (!hasOwn(target, key)) {
        return
    }
    delete target[key];
    if (!ob) {
        return
    }
    ob.dep.notify();
}

/**
 * Collect dependencies on array elements when the array is touched, since
 * we cannot intercept array element access like property getters.
 */
function dependArray (value) {
    for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
        e = value[i];
        e && e.__ob__ && e.__ob__.dep.depend();
        if (Array.isArray(e)) {
            dependArray(e);
        }
    }
}

/*  */

/**
 * Option overwriting strategies are functions that handle
 * how to merge a parent option value and a child option
 * value into the final value.
 */
var strats = config.optionMergeStrategies;

/**
 * Options with restrictions
 */
{
    strats.el = strats.propsData = function (parent, child, vm, key) {
        if (!vm) {
            warn(
                "option \"" + key + "\" can only be used during instance " +
                'creation with the `new` keyword.'
            );
        }
        return defaultStrat(parent, child)
    };
}

/**
 * Helper that recursively merges two data objects together.
 */
function mergeData (to, from) {
    if (!from) { return to }
    var key, toVal, fromVal;

    var keys = hasSymbol
        ? Reflect.ownKeys(from)
        : Object.keys(from);

    for (var i = 0; i < keys.length; i++) {
        key = keys[i];
        // in case the object is already observed...
        if (key === '__ob__') { continue }
        toVal = to[key];
        fromVal = from[key];
        if (!hasOwn(to, key)) {
            set(to, key, fromVal);
        } else if (
            toVal !== fromVal &&
            isPlainObject(toVal) &&
            isPlainObject(fromVal)
        ) {
            mergeData(toVal, fromVal);
        }
    }
    return to
}

/**
 * Data
 */
function mergeDataOrFn (
    parentVal,
    childVal,
    vm
) {
    if (!vm) {
        // in a Vue.extend merge, both should be functions
        if (!childVal) {
            return parentVal
        }
        if (!parentVal) {
            return childVal
        }
        // when parentVal & childVal are both present,
        // we need to return a function that returns the
        // merged result of both functions... no need to
        // check if parentVal is a function here because
        // it has to be a function to pass previous merges.
        return function mergedDataFn () {
            return mergeData(
                typeof childVal === 'function' ? childVal.call(this, this) : childVal,
                typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
            )
        }
    } else {
        return function mergedInstanceDataFn () {
            // instance merge
            var instanceData = typeof childVal === 'function'
                ? childVal.call(vm, vm)
                : childVal;
            var defaultData = typeof parentVal === 'function'
                ? parentVal.call(vm, vm)
                : parentVal;
            if (instanceData) {
                return mergeData(instanceData, defaultData)
            } else {
                return defaultData
            }
        }
    }
}

strats.data = function (
    parentVal,
    childVal,
    vm
) {
    if (!vm) {
        if (childVal && typeof childVal !== 'function') {
            warn(
                'The "data" option should be a function ' +
                'that returns a per-instance value in component ' +
                'definitions.',
                vm
            );

            return parentVal
        }
        return mergeDataOrFn(parentVal, childVal)
    }

    return mergeDataOrFn(parentVal, childVal, vm)
};

/**
 * Hooks and props are merged as arrays.
 */
function mergeHook (
    parentVal,
    childVal
) {
    var res = childVal
        ? parentVal
            ? parentVal.concat(childVal)
            : Array.isArray(childVal)
                ? childVal
                : [childVal]
        : parentVal;
    return res
        ? dedupeHooks(res)
        : res
}

function dedupeHooks (hooks) {
    var res = [];
    for (var i = 0; i < hooks.length; i++) {
        if (res.indexOf(hooks[i]) === -1) {
            res.push(hooks[i]);
        }
    }
    return res
}

LIFECYCLE_HOOKS.forEach(function (hook) {
    strats[hook] = mergeHook;
});

/**
 * Assets
 *
 * When a vm is present (instance creation), we need to do
 * a three-way merge between constructor options, instance
 * options and parent options.
 */
function mergeAssets (
    parentVal,
    childVal,
    vm,
    key
) {
    var res = Object.create(parentVal || null);
    if (childVal) {
        assertObjectType(key, childVal, vm);
        return extend(res, childVal)
    } else {
        return res
    }
}

ASSET_TYPES.forEach(function (type) {
    strats[type + 's'] = mergeAssets;
});

/**
 * Watchers.
 *
 * Watchers hashes should not overwrite one
 * another, so we merge them as arrays.
 */
strats.watch = function (
    parentVal,
    childVal,
    vm,
    key
) {
    // work around Firefox's Object.prototype.watch...
    if (parentVal === nativeWatch) { parentVal = undefined; }
    if (childVal === nativeWatch) { childVal = undefined; }
    /* istanbul ignore if */
    if (!childVal) { return Object.create(parentVal || null) }
    {
        assertObjectType(key, childVal, vm);
    }
    if (!parentVal) { return childVal }
    var ret = {};
    extend(ret, parentVal);
    for (var key$1 in childVal) {
        var parent = ret[key$1];
        var child = childVal[key$1];
        if (parent && !Array.isArray(parent)) {
            parent = [parent];
        }
        ret[key$1] = parent
            ? parent.concat(child)
            : Array.isArray(child) ? child : [child];
    }
    return ret
};

/**
 * Other object hashes.
 */
strats.props =
    strats.methods =
        strats.inject =
            strats.computed = function (
                parentVal,
                childVal,
                vm,
                key
            ) {
                if (childVal && "development" !== 'production') {
                    assertObjectType(key, childVal, vm);
                }
                if (!parentVal) { return childVal }
                var ret = Object.create(null);
                extend(ret, parentVal);
                if (childVal) { extend(ret, childVal); }
                return ret
            };
strats.provide = mergeDataOrFn;

/**
 * Default strategy.
 */
var defaultStrat = function (parentVal, childVal) {
    return childVal === undefined
        ? parentVal
        : childVal
};

/**
 * Validate component names
 */
function checkComponents (options) {
    for (var key in options.components) {
        validateComponentName(key);
    }
}

function validateComponentName (name) {
    if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
        warn(
            'Invalid component name: "' + name + '". Component names ' +
            'should conform to valid custom element name in html5 specification.'
        );
    }
    if (isBuiltInTag(name) || config.isReservedTag(name)) {
        warn(
            'Do not use built-in or reserved HTML elements as component ' +
            'id: ' + name
        );
    }
}

/**
 * Ensure all props option syntax are normalized into the
 * Object-based format.
 */
function normalizeProps (options, vm) {
    var props = options.props;
    if (!props) { return }
    var res = {};
    var i, val, name;
    if (Array.isArray(props)) {
        i = props.length;
        while (i--) {
            val = props[i];
            if (typeof val === 'string') {
                name = camelize(val);
                res[name] = { type: null };
            } else {
                warn('props must be strings when using array syntax.');
            }
        }
    } else if (isPlainObject(props)) {
        for (var key in props) {
            val = props[key];
            name = camelize(key);
            res[name] = isPlainObject(val)
                ? val
                : { type: val };
        }
    } else {
        warn(
            "Invalid value for option \"props\": expected an Array or an Object, " +
            "but got " + (toRawType(props)) + ".",
            vm
        );
    }
    options.props = res;
}

/**
 * Normalize all injections into Object-based format
 */
function normalizeInject (options, vm) {
    var inject = options.inject;
    if (!inject) { return }
    var normalized = options.inject = {};
    if (Array.isArray(inject)) {
        for (var i = 0; i < inject.length; i++) {
            normalized[inject[i]] = { from: inject[i] };
        }
    } else if (isPlainObject(inject)) {
        for (var key in inject) {
            var val = inject[key];
            normalized[key] = isPlainObject(val)
                ? extend({ from: key }, val)
                : { from: val };
        }
    } else {
        warn(
            "Invalid value for option \"inject\": expected an Array or an Object, " +
            "but got " + (toRawType(inject)) + ".",
            vm
        );
    }
}

/**
 * Normalize raw function directives into object format.
 */
function normalizeDirectives (options) {
    var dirs = options.directives;
    if (dirs) {
        for (var key in dirs) {
            var def$$1 = dirs[key];
            if (typeof def$$1 === 'function') {
                dirs[key] = { bind: def$$1, update: def$$1 };
            }
        }
    }
}

function assertObjectType (name, value, vm) {
    if (!isPlainObject(value)) {
        warn(
            "Invalid value for option \"" + name + "\": expected an Object, " +
            "but got " + (toRawType(value)) + ".",
            vm
        );
    }
}

/**
 * Merge two option objects into a new one.
 * Core utility used in both instantiation and inheritance.
 */
function mergeOptions (
    parent,
    child,
    vm
) {
    {
        checkComponents(child);
    }

    if (typeof child === 'function') {
        child = child.options;
    }

    normalizeProps(child, vm);
    normalizeInject(child, vm);
    normalizeDirectives(child);

    // Apply extends and mixins on the child options,
    // but only if it is a raw options object that isn't
    // the result of another mergeOptions call.
    // Only merged options has the _base property.
    if (!child._base) {
        if (child.extends) {
            parent = mergeOptions(parent, child.extends, vm);
        }
        if (child.mixins) {
            for (var i = 0, l = child.mixins.length; i < l; i++) {
                parent = mergeOptions(parent, child.mixins[i], vm);
            }
        }
    }

    var options = {};
    var key;
    for (key in parent) {
        mergeField(key);
    }
    for (key in child) {
        if (!hasOwn(parent, key)) {
            mergeField(key);
        }
    }
    function mergeField (key) {
        var strat = strats[key] || defaultStrat;
        options[key] = strat(parent[key], child[key], vm, key);
    }
    return options
}

/**
 * Resolve an asset.
 * This function is used because child instances need access
 * to assets defined in its ancestor chain.
 */
function resolveAsset (
    options,
    type,
    id,
    warnMissing
) {
    /* istanbul ignore if */
    if (typeof id !== 'string') {
        return
    }
    var assets = options[type];
    // check local registration variations first
    if (hasOwn(assets, id)) { return assets[id] }
    var camelizedId = camelize(id);
    if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
    var PascalCaseId = capitalize(camelizedId);
    if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
    // fallback to prototype chain
    var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
    if (warnMissing && !res) {
        warn(
            'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
            options
        );
    }
    return res
}

/*  */



function validateProp (
    key,
    propOptions,
    propsData,
    vm
) {
    var prop = propOptions[key];
    var absent = !hasOwn(propsData, key);
    var value = propsData[key];
    // boolean casting
    var booleanIndex = getTypeIndex(Boolean, prop.type);
    if (booleanIndex > -1) {
        if (absent && !hasOwn(prop, 'default')) {
            value = false;
        } else if (value === '' || value === hyphenate(key)) {
            // only cast empty string / same name to boolean if
            // boolean has higher priority
            var stringIndex = getTypeIndex(String, prop.type);
            if (stringIndex < 0 || booleanIndex < stringIndex) {
                value = true;
            }
        }
    }
    // check default value
    if (value === undefined) {
        value = getPropDefaultValue(vm, prop, key);
        // since the default value is a fresh copy,
        // make sure to observe it.
        var prevShouldObserve = shouldObserve;
        toggleObserving(true);
        observe(value);
        toggleObserving(prevShouldObserve);
    }
    {
        assertProp(prop, key, value, vm, absent);
    }
    return value
}

/**
 * Get the default value of a prop.
 */
function getPropDefaultValue (vm, prop, key) {
    // no default, return undefined
    if (!hasOwn(prop, 'default')) {
        return undefined
    }
    var def = prop.default;
    // warn against non-factory defaults for Object & Array
    if (isObject(def)) {
        warn(
            'Invalid default value for prop "' + key + '": ' +
            'Props with type Object/Array must use a factory function ' +
            'to return the default value.',
            vm
        );
    }
    // the raw prop value was also undefined from previous render,
    // return previous default value to avoid unnecessary watcher trigger
    if (vm && vm.$options.propsData &&
        vm.$options.propsData[key] === undefined &&
        vm._props[key] !== undefined
    ) {
        return vm._props[key]
    }
    // call factory function for non-Function types
    // a value is Function if its prototype is function even across different execution context
    return typeof def === 'function' && getType(prop.type) !== 'Function'
        ? def.call(vm)
        : def
}

/**
 * Assert whether a prop is valid.
 */
function assertProp (
    prop,
    name,
    value,
    vm,
    absent
) {
    if (prop.required && absent) {
        warn(
            'Missing required prop: "' + name + '"',
            vm
        );
        return
    }
    if (value == null && !prop.required) {
        return
    }
    var type = prop.type;
    var valid = !type || type === true;
    var expectedTypes = [];
    if (type) {
        if (!Array.isArray(type)) {
            type = [type];
        }
        for (var i = 0; i < type.length && !valid; i++) {
            var assertedType = assertType(value, type[i]);
            expectedTypes.push(assertedType.expectedType || '');
            valid = assertedType.valid;
        }
    }

    if (!valid) {
        warn(
            getInvalidTypeMessage(name, value, expectedTypes),
            vm
        );
        return
    }
    var validator = prop.validator;
    if (validator) {
        if (!validator(value)) {
            warn(
                'Invalid prop: custom validator check failed for prop "' + name + '".',
                vm
            );
        }
    }
}

var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;

function assertType (value, type) {
    var valid;
    var expectedType = getType(type);
    if (simpleCheckRE.test(expectedType)) {
        var t = typeof value;
        valid = t === expectedType.toLowerCase();
        // for primitive wrapper objects
        if (!valid && t === 'object') {
            valid = value instanceof type;
        }
    } else if (expectedType === 'Object') {
        valid = isPlainObject(value);
    } else if (expectedType === 'Array') {
        valid = Array.isArray(value);
    } else {
        valid = value instanceof type;
    }
    return {
        valid: valid,
        expectedType: expectedType
    }
}

/**
 * Use function string name to check built-in types,
 * because a simple equality check will fail when running
 * across different vms / iframes.
 */
function getType (fn) {
    var match = fn && fn.toString().match(/^\s*function (\w+)/);
    return match ? match[1] : ''
}

function isSameType (a, b) {
    return getType(a) === getType(b)
}

function getTypeIndex (type, expectedTypes) {
    if (!Array.isArray(expectedTypes)) {
        return isSameType(expectedTypes, type) ? 0 : -1
    }
    for (var i = 0, len = expectedTypes.length; i < len; i++) {
        if (isSameType(expectedTypes[i], type)) {
            return i
        }
    }
    return -1
}

function getInvalidTypeMessage (name, value, expectedTypes) {
    var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
        " Expected " + (expectedTypes.map(capitalize).join(', '));
    var expectedType = expectedTypes[0];
    var receivedType = toRawType(value);
    var expectedValue = styleValue(value, expectedType);
    var receivedValue = styleValue(value, receivedType);
    // check if we need to specify expected value
    if (expectedTypes.length === 1 &&
        isExplicable(expectedType) &&
        !isBoolean(expectedType, receivedType)) {
        message += " with value " + expectedValue;
    }
    message += ", got " + receivedType + " ";
    // check if we need to specify received value
    if (isExplicable(receivedType)) {
        message += "with value " + receivedValue + ".";
    }
    return message
}

function styleValue (value, type) {
    if (type === 'String') {
        return ("\"" + value + "\"")
    } else if (type === 'Number') {
        return ("" + (Number(value)))
    } else {
        return ("" + value)
    }
}

function isExplicable (value) {
    var explicitTypes = ['string', 'number', 'boolean'];
    return explicitTypes.some(function (elem) { return value.toLowerCase() === elem; })
}

function isBoolean () {
    var args = [], len = arguments.length;
    while ( len-- ) args[ len ] = arguments[ len ];

    return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })
}

/*  */

function handleError (err, vm, info) {
    // Deactivate deps tracking while processing error handler to avoid possible infinite rendering.
    // See: https://github.com/vuejs/vuex/issues/1505
    pushTarget();
    try {
        if (vm) {
            var cur = vm;
            while ((cur = cur.$parent)) {
                var hooks = cur.$options.errorCaptured;
                if (hooks) {
                    for (var i = 0; i < hooks.length; i++) {
                        try {
                            var capture = hooks[i].call(cur, err, vm, info) === false;
                            if (capture) { return }
                        } catch (e) {
                            globalHandleError(e, cur, 'errorCaptured hook');
                        }
                    }
                }
            }
        }
        globalHandleError(err, vm, info);
    } finally {
        popTarget();
    }
}

function invokeWithErrorHandling (
    handler,
    context,
    args,
    vm,
    info
) {
    var res;
    try {
        res = args ? handler.apply(context, args) : handler.call(context);
        if (res && !res._isVue && isPromise(res) && !res._handled) {
            res.catch(function (e) { return handleError(e, vm, info + " (Promise/async)"); });
            // issue #9511
            // avoid catch triggering multiple times when nested calls
            res._handled = true;
        }
    } catch (e) {
        handleError(e, vm, info);
    }
    return res
}

function globalHandleError (err, vm, info) {
    if (config.errorHandler) {
        try {
            return config.errorHandler.call(null, err, vm, info)
        } catch (e) {
            // if the user intentionally throws the original error in the handler,
            // do not log it twice
            if (e !== err) {
                logError(e, null, 'config.errorHandler');
            }
        }
    }
    logError(err, vm, info);
}

function logError (err, vm, info) {
    {
        warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
    }
    /* istanbul ignore else */
    if ((inBrowser || inWeex) && typeof console !== 'undefined') {
        console.error(err);
    } else {
        throw err
    }
}

/*  */

var isUsingMicroTask = false;

var callbacks = [];
var pending = false;

function flushCallbacks () {
    pending = false;
    var copies = callbacks.slice(0);
    callbacks.length = 0;
    for (var i = 0; i < copies.length; i++) {
        copies[i]();
    }
}

// Here we have async deferring wrappers using microtasks.
// In 2.5 we used (macro) tasks (in combination with microtasks).
// However, it has subtle problems when state is changed right before repaint
// (e.g. #6813, out-in transitions).
// Also, using (macro) tasks in event handler would cause some weird behaviors
// that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
// So we now use microtasks everywhere, again.
// A major drawback of this tradeoff is that there are some scenarios
// where microtasks have too high a priority and fire in between supposedly
// sequential events (e.g. #4521, #6690, which have workarounds)
// or even between bubbling of the same event (#6566).
var timerFunc;

// The nextTick behavior leverages the microtask queue, which can be accessed
// via either native Promise.then or MutationObserver.
// MutationObserver has wider support, however it is seriously bugged in
// UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
// completely stops working after triggering a few times... so, if native
// Promise is available, we will use it:
/* istanbul ignore next, $flow-disable-line */
if (typeof Promise !== 'undefined' && isNative(Promise)) {
    var p = Promise.resolve();
    timerFunc = function () {
        p.then(flushCallbacks);
        // In problematic UIWebViews, Promise.then doesn't completely break, but
        // it can get stuck in a weird state where callbacks are pushed into the
        // microtask queue but the queue isn't being flushed, until the browser
        // needs to do some other work, e.g. handle a timer. Therefore we can
        // "force" the microtask queue to be flushed by adding an empty timer.
        if (isIOS) { setTimeout(noop); }
    };
    isUsingMicroTask = true;
} else if (!isIE && typeof MutationObserver !== 'undefined' && (
    isNative(MutationObserver) ||
    // PhantomJS and iOS 7.x
    MutationObserver.toString() === '[object MutationObserverConstructor]'
)) {
    // Use MutationObserver where native Promise is not available,
    // e.g. PhantomJS, iOS7, Android 4.4
    // (#6466 MutationObserver is unreliable in IE11)
    var counter = 1;
    var observer = new MutationObserver(flushCallbacks);
    var textNode = document.createTextNode(String(counter));
    observer.observe(textNode, {
        characterData: true
    });
    timerFunc = function () {
        counter = (counter + 1) % 2;
        textNode.data = String(counter);
    };
    isUsingMicroTask = true;
} else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
    // Fallback to setImmediate.
    // Techinically it leverages the (macro) task queue,
    // but it is still a better choice than setTimeout.
    timerFunc = function () {
        setImmediate(flushCallbacks);
    };
} else {
    // Fallback to setTimeout.
    timerFunc = function () {
        setTimeout(flushCallbacks, 0);
    };
}

function nextTick (cb, ctx) {
    var _resolve;
    callbacks.push(function () {
        if (cb) {
            try {
                cb.call(ctx);
            } catch (e) {
                handleError(e, ctx, 'nextTick');
            }
        } else if (_resolve) {
            _resolve(ctx);
        }
    });
    if (!pending) {
        pending = true;
        timerFunc();
    }
    // $flow-disable-line
    if (!cb && typeof Promise !== 'undefined') {
        return new Promise(function (resolve) {
            _resolve = resolve;
        })
    }
}

/*  */

var mark;
var measure;

{
    var perf = inBrowser && window.performance;
    /* istanbul ignore if */
    if (
        perf &&
        perf.mark &&
        perf.measure &&
        perf.clearMarks &&
        perf.clearMeasures
    ) {
        mark = function (tag) { return perf.mark(tag); };
        measure = function (name, startTag, endTag) {
            perf.measure(name, startTag, endTag);
            perf.clearMarks(startTag);
            perf.clearMarks(endTag);
            // perf.clearMeasures(name)
        };
    }
}

/* not type checking this file because flow doesn't play well with Proxy */

var initProxy;

{
    var allowedGlobals = makeMap(
        'Infinity,undefined,NaN,isFinite,isNaN,' +
        'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
        'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
        'require' // for Webpack/Browserify
    );

    var warnNonPresent = function (target, key) {
        warn(
            "Property or method \"" + key + "\" is not defined on the instance but " +
            'referenced during render. Make sure that this property is reactive, ' +
            'either in the data option, or for class-based components, by ' +
            'initializing the property. ' +
            'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
            target
        );
    };

    var warnReservedPrefix = function (target, key) {
        warn(
            "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
            'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
            'prevent conflicts with Vue internals' +
            'See: https://vuejs.org/v2/api/#data',
            target
        );
    };

    var hasProxy =
        typeof Proxy !== 'undefined' && isNative(Proxy);

    if (hasProxy) {
        var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
        config.keyCodes = new Proxy(config.keyCodes, {
            set: function set (target, key, value) {
                if (isBuiltInModifier(key)) {
                    warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                    return false
                } else {
                    target[key] = value;
                    return true
                }
            }
        });
    }

    var hasHandler = {
        has: function has (target, key) {
            var has = key in target;
            var isAllowed = allowedGlobals(key) ||
                (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
            if (!has && !isAllowed) {
                if (key in target.$data) { warnReservedPrefix(target, key); }
                else { warnNonPresent(target, key); }
            }
            return has || !isAllowed
        }
    };

    var getHandler = {
        get: function get (target, key) {
            if (typeof key === 'string' && !(key in target)) {
                if (key in target.$data) { warnReservedPrefix(target, key); }
                else { warnNonPresent(target, key); }
            }
            return target[key]
        }
    };

    initProxy = function initProxy (vm) {
        if (hasProxy) {
            // determine which proxy handler to use
            var options = vm.$options;
            var handlers = options.render && options.render._withStripped
                ? getHandler
                : hasHandler;
            vm._renderProxy = new Proxy(vm, handlers);
        } else {
            vm._renderProxy = vm;
        }
    };
}

/*  */

var seenObjects = new _Set();

/**
 * Recursively traverse an object to evoke all converted
 * getters, so that every nested property inside the object
 * is collected as a "deep" dependency.
 */
function traverse (val) {
    _traverse(val, seenObjects);
    seenObjects.clear();
}

function _traverse (val, seen) {
    var i, keys;
    var isA = Array.isArray(val);
    if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
        return
    }
    if (val.__ob__) {
        var depId = val.__ob__.dep.id;
        if (seen.has(depId)) {
            return
        }
        seen.add(depId);
    }
    if (isA) {
        i = val.length;
        while (i--) { _traverse(val[i], seen); }
    } else {
        keys = Object.keys(val);
        i = keys.length;
        while (i--) { _traverse(val[keys[i]], seen); }
    }
}

/*  */

var normalizeEvent = cached(function (name) {
    var passive = name.charAt(0) === '&';
    name = passive ? name.slice(1) : name;
    var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
    name = once$$1 ? name.slice(1) : name;
    var capture = name.charAt(0) === '!';
    name = capture ? name.slice(1) : name;
    return {
        name: name,
        once: once$$1,
        capture: capture,
        passive: passive
    }
});

function createFnInvoker (fns, vm) {
    function invoker () {
        var arguments$1 = arguments;

        var fns = invoker.fns;
        if (Array.isArray(fns)) {
            var cloned = fns.slice();
            for (var i = 0; i < cloned.length; i++) {
                invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
            }
        } else {
            // return handler return value for single handlers
            return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
        }
    }
    invoker.fns = fns;
    return invoker
}

function updateListeners (
    on,
    oldOn,
    add,
    remove$$1,
    createOnceHandler,
    vm
) {
    var name, def$$1, cur, old, event;
    for (name in on) {
        def$$1 = cur = on[name];
        old = oldOn[name];
        event = normalizeEvent(name);
        if (isUndef(cur)) {
            warn(
                "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                vm
            );
        } else if (isUndef(old)) {
            if (isUndef(cur.fns)) {
                cur = on[name] = createFnInvoker(cur, vm);
            }
            if (isTrue(event.once)) {
                cur = on[name] = createOnceHandler(event.name, cur, event.capture);
            }
            add(event.name, cur, event.capture, event.passive, event.params);
        } else if (cur !== old) {
            old.fns = cur;
            on[name] = old;
        }
    }
    for (name in oldOn) {
        if (isUndef(on[name])) {
            event = normalizeEvent(name);
            remove$$1(event.name, oldOn[name], event.capture);
        }
    }
}

/*  */

function mergeVNodeHook (def, hookKey, hook) {
    if (def instanceof VNode) {
        def = def.data.hook || (def.data.hook = {});
    }
    var invoker;
    var oldHook = def[hookKey];

    function wrappedHook () {
        hook.apply(this, arguments);
        // important: remove merged hook to ensure it's called only once
        // and prevent memory leak
        remove(invoker.fns, wrappedHook);
    }

    if (isUndef(oldHook)) {
        // no existing hook
        invoker = createFnInvoker([wrappedHook]);
    } else {
        /* istanbul ignore if */
        if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
            // already a merged invoker
            invoker = oldHook;
            invoker.fns.push(wrappedHook);
        } else {
            // existing plain hook
            invoker = createFnInvoker([oldHook, wrappedHook]);
        }
    }

    invoker.merged = true;
    def[hookKey] = invoker;
}

/*  */

function extractPropsFromVNodeData (
    data,
    Ctor,
    tag
) {
    // we are only extracting raw values here.
    // validation and default values are handled in the child
    // component itself.
    var propOptions = Ctor.options.props;
    if (isUndef(propOptions)) {
        return
    }
    var res = {};
    var attrs = data.attrs;
    var props = data.props;
    if (isDef(attrs) || isDef(props)) {
        for (var key in propOptions) {
            var altKey = hyphenate(key);
            {
                var keyInLowerCase = key.toLowerCase();
                if (
                    key !== keyInLowerCase &&
                    attrs && hasOwn(attrs, keyInLowerCase)
                ) {
                    tip(
                        "Prop \"" + keyInLowerCase + "\" is passed to component " +
                        (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                        " \"" + key + "\". " +
                        "Note that HTML attributes are case-insensitive and camelCased " +
                        "props need to use their kebab-case equivalents when using in-DOM " +
                        "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
                    );
                }
            }
            checkProp(res, props, key, altKey, true) ||
            checkProp(res, attrs, key, altKey, false);
        }
    }
    return res
}

function checkProp (
    res,
    hash,
    key,
    altKey,
    preserve
) {
    if (isDef(hash)) {
        if (hasOwn(hash, key)) {
            res[key] = hash[key];
            if (!preserve) {
                delete hash[key];
            }
            return true
        } else if (hasOwn(hash, altKey)) {
            res[key] = hash[altKey];
            if (!preserve) {
                delete hash[altKey];
            }
            return true
        }
    }
    return false
}

/*  */

// The template compiler attempts to minimize the need for normalization by
// statically analyzing the template at compile time.
//
// For plain HTML markup, normalization can be completely skipped because the
// generated render function is guaranteed to return Array<VNode>. There are
// two cases where extra normalization is needed:

// 1. When the children contains components - because a functional component
// may return an Array instead of a single root. In this case, just a simple
// normalization is needed - if any child is an Array, we flatten the whole
// thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
// because functional components already normalize their own children.
function simpleNormalizeChildren (children) {
    for (var i = 0; i < children.length; i++) {
        if (Array.isArray(children[i])) {
            return Array.prototype.concat.apply([], children)
        }
    }
    return children
}

// 2. When the children contains constructs that always generated nested Arrays,
// e.g. <template>, <slot>, v-for, or when the children is provided by user
// with hand-written render functions / JSX. In such cases a full normalization
// is needed to cater to all possible types of children values.
function normalizeChildren (children) {
    return isPrimitive(children)
        ? [createTextVNode(children)]
        : Array.isArray(children)
            ? normalizeArrayChildren(children)
            : undefined
}

function isTextNode (node) {
    return isDef(node) && isDef(node.text) && isFalse(node.isComment)
}

function normalizeArrayChildren (children, nestedIndex) {
    var res = [];
    var i, c, lastIndex, last;
    for (i = 0; i < children.length; i++) {
        c = children[i];
        if (isUndef(c) || typeof c === 'boolean') { continue }
        lastIndex = res.length - 1;
        last = res[lastIndex];
        //  nested
        if (Array.isArray(c)) {
            if (c.length > 0) {
                c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
                // merge adjacent text nodes
                if (isTextNode(c[0]) && isTextNode(last)) {
                    res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                    c.shift();
                }
                res.push.apply(res, c);
            }
        } else if (isPrimitive(c)) {
            if (isTextNode(last)) {
                // merge adjacent text nodes
                // this is necessary for SSR hydration because text nodes are
                // essentially merged when rendered to HTML strings
                res[lastIndex] = createTextVNode(last.text + c);
            } else if (c !== '') {
                // convert primitive to vnode
                res.push(createTextVNode(c));
            }
        } else {
            if (isTextNode(c) && isTextNode(last)) {
                // merge adjacent text nodes
                res[lastIndex] = createTextVNode(last.text + c.text);
            } else {
                // default key for nested array children (likely generated by v-for)
                if (isTrue(children._isVList) &&
                    isDef(c.tag) &&
                    isUndef(c.key) &&
                    isDef(nestedIndex)) {
                    c.key = "__vlist" + nestedIndex + "_" + i + "__";
                }
                res.push(c);
            }
        }
    }
    return res
}

/*  */

function initProvide (vm) {
    var provide = vm.$options.provide;
    if (provide) {
        vm._provided = typeof provide === 'function'
            ? provide.call(vm)
            : provide;
    }
}

function initInjections (vm) {
    var result = resolveInject(vm.$options.inject, vm);
    if (result) {
        toggleObserving(false);
        Object.keys(result).forEach(function (key) {
            /* istanbul ignore else */
            {
                defineReactive$$1(vm, key, result[key], function () {
                    warn(
                        "Avoid mutating an injected value directly since the changes will be " +
                        "overwritten whenever the provided component re-renders. " +
                        "injection being mutated: \"" + key + "\"",
                        vm
                    );
                });
            }
        });
        toggleObserving(true);
    }
}

function resolveInject (inject, vm) {
    if (inject) {
        // inject is :any because flow is not smart enough to figure out cached
        var result = Object.create(null);
        var keys = hasSymbol
            ? Reflect.ownKeys(inject)
            : Object.keys(inject);

        for (var i = 0; i < keys.length; i++) {
            var key = keys[i];
            // #6574 in case the inject object is observed...
            if (key === '__ob__') { continue }
            var provideKey = inject[key].from;
            var source = vm;
            while (source) {
                if (source._provided && hasOwn(source._provided, provideKey)) {
                    result[key] = source._provided[provideKey];
                    break
                }
                source = source.$parent;
            }
            if (!source) {
                if ('default' in inject[key]) {
                    var provideDefault = inject[key].default;
                    result[key] = typeof provideDefault === 'function'
                        ? provideDefault.call(vm)
                        : provideDefault;
                } else {
                    warn(("Injection \"" + key + "\" not found"), vm);
                }
            }
        }
        return result
    }
}

/*  */



/**
 * Runtime helper for resolving raw children VNodes into a slot object.
 */
function resolveSlots (
    children,
    context
) {
    if (!children || !children.length) {
        return {}
    }
    var slots = {};
    for (var i = 0, l = children.length; i < l; i++) {
        var child = children[i];
        var data = child.data;
        // remove slot attribute if the node is resolved as a Vue slot node
        if (data && data.attrs && data.attrs.slot) {
            delete data.attrs.slot;
        }
        // named slots should only be respected if the vnode was rendered in the
        // same context.
        if ((child.context === context || child.fnContext === context) &&
            data && data.slot != null
        ) {
            var name = data.slot;
            var slot = (slots[name] || (slots[name] = []));
            if (child.tag === 'template') {
                slot.push.apply(slot, child.children || []);
            } else {
                slot.push(child);
            }
        } else {
            (slots.default || (slots.default = [])).push(child);
        }
    }
    // ignore slots that contains only whitespace
    for (var name$1 in slots) {
        if (slots[name$1].every(isWhitespace)) {
            delete slots[name$1];
        }
    }
    return slots
}

function isWhitespace (node) {
    return (node.isComment && !node.asyncFactory) || node.text === ' '
}

/*  */

function normalizeScopedSlots (
    slots,
    normalSlots,
    prevSlots
) {
    var res;
    var hasNormalSlots = Object.keys(normalSlots).length > 0;
    var isStable = slots ? !!slots.$stable : !hasNormalSlots;
    var key = slots && slots.$key;
    if (!slots) {
        res = {};
    } else if (slots._normalized) {
        // fast path 1: child component re-render only, parent did not change
        return slots._normalized
    } else if (
        isStable &&
        prevSlots &&
        prevSlots !== emptyObject &&
        key === prevSlots.$key &&
        !hasNormalSlots &&
        !prevSlots.$hasNormal
    ) {
        // fast path 2: stable scoped slots w/ no normal slots to proxy,
        // only need to normalize once
        return prevSlots
    } else {
        res = {};
        for (var key$1 in slots) {
            if (slots[key$1] && key$1[0] !== '$') {
                res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
            }
        }
    }
    // expose normal slots on scopedSlots
    for (var key$2 in normalSlots) {
        if (!(key$2 in res)) {
            res[key$2] = proxyNormalSlot(normalSlots, key$2);
        }
    }
    // avoriaz seems to mock a non-extensible $scopedSlots object
    // and when that is passed down this would cause an error
    if (slots && Object.isExtensible(slots)) {
        (slots)._normalized = res;
    }
    def(res, '$stable', isStable);
    def(res, '$key', key);
    def(res, '$hasNormal', hasNormalSlots);
    return res
}

function normalizeScopedSlot(normalSlots, key, fn) {
    var normalized = function () {
        var res = arguments.length ? fn.apply(null, arguments) : fn({});
        res = res && typeof res === 'object' && !Array.isArray(res)
            ? [res] // single vnode
            : normalizeChildren(res);
        return res && (
            res.length === 0 ||
            (res.length === 1 && res[0].isComment) // #9658
        ) ? undefined
            : res
    };
    // this is a slot using the new v-slot syntax without scope. although it is
    // compiled as a scoped slot, render fn users would expect it to be present
    // on this.$slots because the usage is semantically a normal slot.
    if (fn.proxy) {
        Object.defineProperty(normalSlots, key, {
            get: normalized,
            enumerable: true,
            configurable: true
        });
    }
    return normalized
}

function proxyNormalSlot(slots, key) {
    return function () { return slots[key]; }
}

/*  */

/**
 * Runtime helper for rendering v-for lists.
 */
function renderList (
    val,
    render
) {
    var ret, i, l, keys, key;
    if (Array.isArray(val) || typeof val === 'string') {
        ret = new Array(val.length);
        for (i = 0, l = val.length; i < l; i++) {
            ret[i] = render(val[i], i);
        }
    } else if (typeof val === 'number') {
        ret = new Array(val);
        for (i = 0; i < val; i++) {
            ret[i] = render(i + 1, i);
        }
    } else if (isObject(val)) {
        if (hasSymbol && val[Symbol.iterator]) {
            ret = [];
            var iterator = val[Symbol.iterator]();
            var result = iterator.next();
            while (!result.done) {
                ret.push(render(result.value, ret.length));
                result = iterator.next();
            }
        } else {
            keys = Object.keys(val);
            ret = new Array(keys.length);
            for (i = 0, l = keys.length; i < l; i++) {
                key = keys[i];
                ret[i] = render(val[key], key, i);
            }
        }
    }
    if (!isDef(ret)) {
        ret = [];
    }
    (ret)._isVList = true;
    return ret
}

/*  */

/**
 * Runtime helper for rendering <slot>
 */
function renderSlot (
    name,
    fallback,
    props,
    bindObject
) {
    var scopedSlotFn = this.$scopedSlots[name];
    var nodes;
    if (scopedSlotFn) { // scoped slot
        props = props || {};
        if (bindObject) {
            if (!isObject(bindObject)) {
                warn(
                    'slot v-bind without argument expects an Object',
                    this
                );
            }
            props = extend(extend({}, bindObject), props);
        }
        nodes = scopedSlotFn(props) || fallback;
    } else {
        nodes = this.$slots[name] || fallback;
    }

    var target = props && props.slot;
    if (target) {
        return this.$createElement('template', { slot: target }, nodes)
    } else {
        return nodes
    }
}

/*  */

/**
 * Runtime helper for resolving filters
 */
function resolveFilter (id) {
    return resolveAsset(this.$options, 'filters', id, true) || identity
}

/*  */

function isKeyNotMatch (expect, actual) {
    if (Array.isArray(expect)) {
        return expect.indexOf(actual) === -1
    } else {
        return expect !== actual
    }
}

/**
 * Runtime helper for checking keyCodes from config.
 * exposed as Vue.prototype._k
 * passing in eventKeyName as last argument separately for backwards compat
 */
function checkKeyCodes (
    eventKeyCode,
    key,
    builtInKeyCode,
    eventKeyName,
    builtInKeyName
) {
    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
        return isKeyNotMatch(builtInKeyName, eventKeyName)
    } else if (mappedKeyCode) {
        return isKeyNotMatch(mappedKeyCode, eventKeyCode)
    } else if (eventKeyName) {
        return hyphenate(eventKeyName) !== key
    }
}

/*  */

/**
 * Runtime helper for merging v-bind="object" into a VNode's data.
 */
function bindObjectProps (
    data,
    tag,
    value,
    asProp,
    isSync
) {
    if (value) {
        if (!isObject(value)) {
            warn(
                'v-bind without argument expects an Object or Array value',
                this
            );
        } else {
            if (Array.isArray(value)) {
                value = toObject(value);
            }
            var hash;
            var loop = function ( key ) {
                if (
                    key === 'class' ||
                    key === 'style' ||
                    isReservedAttribute(key)
                ) {
                    hash = data;
                } else {
                    var type = data.attrs && data.attrs.type;
                    hash = asProp || config.mustUseProp(tag, type, key)
                        ? data.domProps || (data.domProps = {})
                        : data.attrs || (data.attrs = {});
                }
                var camelizedKey = camelize(key);
                var hyphenatedKey = hyphenate(key);
                if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
                    hash[key] = value[key];

                    if (isSync) {
                        var on = data.on || (data.on = {});
                        on[("update:" + key)] = function ($event) {
                            value[key] = $event;
                        };
                    }
                }
            };

            for (var key in value) loop( key );
        }
    }
    return data
}

/*  */

/**
 * Runtime helper for rendering static trees.
 */
function renderStatic (
    index,
    isInFor
) {
    var cached = this._staticTrees || (this._staticTrees = []);
    var tree = cached[index];
    // if has already-rendered static tree and not inside v-for,
    // we can reuse the same tree.
    if (tree && !isInFor) {
        return tree
    }
    // otherwise, render a fresh tree.
    tree = cached[index] = this.$options.staticRenderFns[index].call(
        this._renderProxy,
        null,
        this // for render fns generated for functional component templates
    );
    markStatic(tree, ("__static__" + index), false);
    return tree
}

/**
 * Runtime helper for v-once.
 * Effectively it means marking the node as static with a unique key.
 */
function markOnce (
    tree,
    index,
    key
) {
    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
    return tree
}

function markStatic (
    tree,
    key,
    isOnce
) {
    if (Array.isArray(tree)) {
        for (var i = 0; i < tree.length; i++) {
            if (tree[i] && typeof tree[i] !== 'string') {
                markStaticNode(tree[i], (key + "_" + i), isOnce);
            }
        }
    } else {
        markStaticNode(tree, key, isOnce);
    }
}

function markStaticNode (node, key, isOnce) {
    node.isStatic = true;
    node.key = key;
    node.isOnce = isOnce;
}

/*  */

function bindObjectListeners (data, value) {
    if (value) {
        if (!isPlainObject(value)) {
            warn(
                'v-on without argument expects an Object value',
                this
            );
        } else {
            var on = data.on = data.on ? extend({}, data.on) : {};
            for (var key in value) {
                var existing = on[key];
                var ours = value[key];
                on[key] = existing ? [].concat(existing, ours) : ours;
            }
        }
    }
    return data
}

/*  */

function resolveScopedSlots (
    fns, // see flow/vnode
    res,
    // the following are added in 2.6
    hasDynamicKeys,
    contentHashKey
) {
    res = res || { $stable: !hasDynamicKeys };
    for (var i = 0; i < fns.length; i++) {
        var slot = fns[i];
        if (Array.isArray(slot)) {
            resolveScopedSlots(slot, res, hasDynamicKeys);
        } else if (slot) {
            // marker for reverse proxying v-slot without scope on this.$slots
            if (slot.proxy) {
                slot.fn.proxy = true;
            }
            res[slot.key] = slot.fn;
        }
    }
    if (contentHashKey) {
        (res).$key = contentHashKey;
    }
    return res
}

/*  */

function bindDynamicKeys (baseObj, values) {
    for (var i = 0; i < values.length; i += 2) {
        var key = values[i];
        if (typeof key === 'string' && key) {
            baseObj[values[i]] = values[i + 1];
        } else if (key !== '' && key !== null) {
            // null is a speical value for explicitly removing a binding
            warn(
                ("Invalid value for dynamic directive argument (expected string or null): " + key),
                this
            );
        }
    }
    return baseObj
}

// helper to dynamically append modifier runtime markers to event names.
// ensure only append when value is already string, otherwise it will be cast
// to string and cause the type check to miss.
function prependModifier (value, symbol) {
    return typeof value === 'string' ? symbol + value : value
}

/*  */

function installRenderHelpers (target) {
    target._o = markOnce;
    target._n = toNumber;
    target._s = toString;
    target._l = renderList;
    target._t = renderSlot;
    target._q = looseEqual;
    target._i = looseIndexOf;
    target._m = renderStatic;
    target._f = resolveFilter;
    target._k = checkKeyCodes;
    target._b = bindObjectProps;
    target._v = createTextVNode;
    target._e = createEmptyVNode;
    target._u = resolveScopedSlots;
    target._g = bindObjectListeners;
    target._d = bindDynamicKeys;
    target._p = prependModifier;
}

/*  */

function FunctionalRenderContext (
    data,
    props,
    children,
    parent,
    Ctor
) {
    var this$1 = this;

    var options = Ctor.options;
    // ensure the createElement function in functional components
    // gets a unique context - this is necessary for correct named slot check
    var contextVm;
    if (hasOwn(parent, '_uid')) {
        contextVm = Object.create(parent);
        // $flow-disable-line
        contextVm._original = parent;
    } else {
        // the context vm passed in is a functional context as well.
        // in this case we want to make sure we are able to get a hold to the
        // real context instance.
        contextVm = parent;
        // $flow-disable-line
        parent = parent._original;
    }
    var isCompiled = isTrue(options._compiled);
    var needNormalization = !isCompiled;

    this.data = data;
    this.props = props;
    this.children = children;
    this.parent = parent;
    this.listeners = data.on || emptyObject;
    this.injections = resolveInject(options.inject, parent);
    this.slots = function () {
        if (!this$1.$slots) {
            normalizeScopedSlots(
                data.scopedSlots,
                this$1.$slots = resolveSlots(children, parent)
            );
        }
        return this$1.$slots
    };

    Object.defineProperty(this, 'scopedSlots', ({
        enumerable: true,
        get: function get () {
            return normalizeScopedSlots(data.scopedSlots, this.slots())
        }
    }));

    // support for compiled functional template
    if (isCompiled) {
        // exposing $options for renderStatic()
        this.$options = options;
        // pre-resolve slots for renderSlot()
        this.$slots = this.slots();
        this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
    }

    if (options._scopeId) {
        this._c = function (a, b, c, d) {
            var vnode = createElement(contextVm, a, b, c, d, needNormalization);
            if (vnode && !Array.isArray(vnode)) {
                vnode.fnScopeId = options._scopeId;
                vnode.fnContext = parent;
            }
            return vnode
        };
    } else {
        this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
    }
}

installRenderHelpers(FunctionalRenderContext.prototype);

function createFunctionalComponent (
    Ctor,
    propsData,
    data,
    contextVm,
    children
) {
    var options = Ctor.options;
    var props = {};
    var propOptions = options.props;
    if (isDef(propOptions)) {
        for (var key in propOptions) {
            props[key] = validateProp(key, propOptions, propsData || emptyObject);
        }
    } else {
        if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
        if (isDef(data.props)) { mergeProps(props, data.props); }
    }

    var renderContext = new FunctionalRenderContext(
        data,
        props,
        children,
        contextVm,
        Ctor
    );

    var vnode = options.render.call(null, renderContext._c, renderContext);

    if (vnode instanceof VNode) {
        return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
    } else if (Array.isArray(vnode)) {
        var vnodes = normalizeChildren(vnode) || [];
        var res = new Array(vnodes.length);
        for (var i = 0; i < vnodes.length; i++) {
            res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
        }
        return res
    }
}

function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
    // #7817 clone node before setting fnContext, otherwise if the node is reused
    // (e.g. it was from a cached normal slot) the fnContext causes named slots
    // that should not be matched to match.
    var clone = cloneVNode(vnode);
    clone.fnContext = contextVm;
    clone.fnOptions = options;
    {
        (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
    }
    if (data.slot) {
        (clone.data || (clone.data = {})).slot = data.slot;
    }
    return clone
}

function mergeProps (to, from) {
    for (var key in from) {
        to[camelize(key)] = from[key];
    }
}

/*  */

/*  */

/*  */

/*  */

// inline hooks to be invoked on component VNodes during patch
var componentVNodeHooks = {
    init: function init (vnode, hydrating) {
        if (
            vnode.componentInstance &&
            !vnode.componentInstance._isDestroyed &&
            vnode.data.keepAlive
        ) {
            // kept-alive components, treat as a patch
            var mountedNode = vnode; // work around flow
            componentVNodeHooks.prepatch(mountedNode, mountedNode);
        } else {
            var child = vnode.componentInstance = createComponentInstanceForVnode(
                vnode,
                activeInstance
            );
            child.$mount(hydrating ? vnode.elm : undefined, hydrating);
        }
    },

    prepatch: function prepatch (oldVnode, vnode) {
        var options = vnode.componentOptions;
        var child = vnode.componentInstance = oldVnode.componentInstance;
        updateChildComponent(
            child,
            options.propsData, // updated props
            options.listeners, // updated listeners
            vnode, // new parent vnode
            options.children // new children
        );
    },

    insert: function insert (vnode) {
        var context = vnode.context;
        var componentInstance = vnode.componentInstance;
        if (!componentInstance._isMounted) {
            componentInstance._isMounted = true;
            callHook(componentInstance, 'mounted');
        }
        if (vnode.data.keepAlive) {
            if (context._isMounted) {
                // vue-router#1212
                // During updates, a kept-alive component's child components may
                // change, so directly walking the tree here may call activated hooks
                // on incorrect children. Instead we push them into a queue which will
                // be processed after the whole patch process ended.
                queueActivatedComponent(componentInstance);
            } else {
                activateChildComponent(componentInstance, true /* direct */);
            }
        }
    },

    destroy: function destroy (vnode) {
        var componentInstance = vnode.componentInstance;
        if (!componentInstance._isDestroyed) {
            if (!vnode.data.keepAlive) {
                componentInstance.$destroy();
            } else {
                deactivateChildComponent(componentInstance, true /* direct */);
            }
        }
    }
};

var hooksToMerge = Object.keys(componentVNodeHooks);

function createComponent (
    Ctor,
    data,
    context,
    children,
    tag
) {
    if (isUndef(Ctor)) {
        return
    }

    var baseCtor = context.$options._base;

    // plain options object: turn it into a constructor
    if (isObject(Ctor)) {
        Ctor = baseCtor.extend(Ctor);
    }

    // if at this stage it's not a constructor or an async component factory,
    // reject.
    if (typeof Ctor !== 'function') {
        {
            warn(("Invalid Component definition: " + (String(Ctor))), context);
        }
        return
    }

    // async component
    var asyncFactory;
    if (isUndef(Ctor.cid)) {
        asyncFactory = Ctor;
        Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
        if (Ctor === undefined) {
            // return a placeholder node for async component, which is rendered
            // as a comment node but preserves all the raw information for the node.
            // the information will be used for async server-rendering and hydration.
            return createAsyncPlaceholder(
                asyncFactory,
                data,
                context,
                children,
                tag
            )
        }
    }

    data = data || {};

    // resolve constructor options in case global mixins are applied after
    // component constructor creation
    resolveConstructorOptions(Ctor);

    // transform component v-model data into props & events
    if (isDef(data.model)) {
        transformModel(Ctor.options, data);
    }

    // extract props
    var propsData = extractPropsFromVNodeData(data, Ctor, tag);

    // functional component
    if (isTrue(Ctor.options.functional)) {
        return createFunctionalComponent(Ctor, propsData, data, context, children)
    }

    // extract listeners, since these needs to be treated as
    // child component listeners instead of DOM listeners
    var listeners = data.on;
    // replace with listeners with .native modifier
    // so it gets processed during parent component patch.
    data.on = data.nativeOn;

    if (isTrue(Ctor.options.abstract)) {
        // abstract components do not keep anything
        // other than props & listeners & slot

        // work around flow
        var slot = data.slot;
        data = {};
        if (slot) {
            data.slot = slot;
        }
    }

    // install component management hooks onto the placeholder node
    installComponentHooks(data);

    // return a placeholder vnode
    var name = Ctor.options.name || tag;
    var vnode = new VNode(
        ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
        data, undefined, undefined, undefined, context,
        { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
        asyncFactory
    );

    return vnode
}

function createComponentInstanceForVnode (
    vnode, // we know it's MountedComponentVNode but flow doesn't
    parent // activeInstance in lifecycle state
) {
    var options = {
        _isComponent: true,
        _parentVnode: vnode,
        parent: parent
    };
    // check inline-template render functions
    var inlineTemplate = vnode.data.inlineTemplate;
    if (isDef(inlineTemplate)) {
        options.render = inlineTemplate.render;
        options.staticRenderFns = inlineTemplate.staticRenderFns;
    }
    return new vnode.componentOptions.Ctor(options)
}

function installComponentHooks (data) {
    var hooks = data.hook || (data.hook = {});
    for (var i = 0; i < hooksToMerge.length; i++) {
        var key = hooksToMerge[i];
        var existing = hooks[key];
        var toMerge = componentVNodeHooks[key];
        if (existing !== toMerge && !(existing && existing._merged)) {
            hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
        }
    }
}

function mergeHook$1 (f1, f2) {
    var merged = function (a, b) {
        // flow complains about extra args which is why we use any
        f1(a, b);
        f2(a, b);
    };
    merged._merged = true;
    return merged
}

// transform component v-model info (value and callback) into
// prop and event handler respectively.
function transformModel (options, data) {
    var prop = (options.model && options.model.prop) || 'value';
    var event = (options.model && options.model.event) || 'input'
    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
    var on = data.on || (data.on = {});
    var existing = on[event];
    var callback = data.model.callback;
    if (isDef(existing)) {
        if (
            Array.isArray(existing)
                ? existing.indexOf(callback) === -1
                : existing !== callback
        ) {
            on[event] = [callback].concat(existing);
        }
    } else {
        on[event] = callback;
    }
}

/*  */

var SIMPLE_NORMALIZE = 1;
var ALWAYS_NORMALIZE = 2;

// wrapper function for providing a more flexible interface
// without getting yelled at by flow
function createElement (
    context,
    tag,
    data,
    children,
    normalizationType,
    alwaysNormalize
) {
    if (Array.isArray(data) || isPrimitive(data)) {
        normalizationType = children;
        children = data;
        data = undefined;
    }
    if (isTrue(alwaysNormalize)) {
        normalizationType = ALWAYS_NORMALIZE;
    }
    return _createElement(context, tag, data, children, normalizationType)
}

function _createElement (
    context,
    tag,
    data,
    children,
    normalizationType
) {
    if (isDef(data) && isDef((data).__ob__)) {
        warn(
            "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
            'Always create fresh vnode data objects in each render!',
            context
        );
        return createEmptyVNode()
    }
    // object syntax in v-bind
    if (isDef(data) && isDef(data.is)) {
        tag = data.is;
    }
    if (!tag) {
        // in case of component :is set to falsy value
        return createEmptyVNode()
    }
    // warn against non-primitive key
    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
    ) {
        {
            warn(
                'Avoid using non-primitive value as key, ' +
                'use string/number value instead.',
                context
            );
        }
    }
    // support single function children as default scoped slot
    if (Array.isArray(children) &&
        typeof children[0] === 'function'
    ) {
        data = data || {};
        data.scopedSlots = { default: children[0] };
        children.length = 0;
    }
    if (normalizationType === ALWAYS_NORMALIZE) {
        children = normalizeChildren(children);
    } else if (normalizationType === SIMPLE_NORMALIZE) {
        children = simpleNormalizeChildren(children);
    }
    var vnode, ns;
    if (typeof tag === 'string') {
        var Ctor;
        ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
        if (config.isReservedTag(tag)) {
            // platform built-in elements
            vnode = new VNode(
                config.parsePlatformTagName(tag), data, children,
                undefined, undefined, context
            );
        } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
            // component
            vnode = createComponent(Ctor, data, context, children, tag);
        } else {
            // unknown or unlisted namespaced elements
            // check at runtime because it may get assigned a namespace when its
            // parent normalizes children
            vnode = new VNode(
                tag, data, children,
                undefined, undefined, context
            );
        }
    } else {
        // direct component options / constructor
        vnode = createComponent(tag, data, context, children);
    }
    if (Array.isArray(vnode)) {
        return vnode
    } else if (isDef(vnode)) {
        if (isDef(ns)) { applyNS(vnode, ns); }
        if (isDef(data)) { registerDeepBindings(data); }
        return vnode
    } else {
        return createEmptyVNode()
    }
}

function applyNS (vnode, ns, force) {
    vnode.ns = ns;
    if (vnode.tag === 'foreignObject') {
        // use default namespace inside foreignObject
        ns = undefined;
        force = true;
    }
    if (isDef(vnode.children)) {
        for (var i = 0, l = vnode.children.length; i < l; i++) {
            var child = vnode.children[i];
            if (isDef(child.tag) && (
                isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
                applyNS(child, ns, force);
            }
        }
    }
}

// ref #5318
// necessary to ensure parent re-render when deep bindings like :style and
// :class are used on slot nodes
function registerDeepBindings (data) {
    if (isObject(data.style)) {
        traverse(data.style);
    }
    if (isObject(data.class)) {
        traverse(data.class);
    }
}

/*  */

function initRender (vm) {
    vm._vnode = null; // the root of the child tree
    vm._staticTrees = null; // v-once cached trees
    var options = vm.$options;
    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
    var renderContext = parentVnode && parentVnode.context;
    vm.$slots = resolveSlots(options._renderChildren, renderContext);
    vm.$scopedSlots = emptyObject;
    // bind the createElement fn to this instance
    // so that we get proper render context inside it.
    // args order: tag, data, children, normalizationType, alwaysNormalize
    // internal version is used by render functions compiled from templates
    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
    // normalization is always applied for the public version, used in
    // user-written render functions.
    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };

    // $attrs & $listeners are exposed for easier HOC creation.
    // they need to be reactive so that HOCs using them are always updated
    var parentData = parentVnode && parentVnode.data;

    /* istanbul ignore else */
    {
        defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
            !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
        }, true);
        defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
            !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
        }, true);
    }
}

var currentRenderingInstance = null;

function renderMixin (Vue) {
    // install runtime convenience helpers
    installRenderHelpers(Vue.prototype);

    Vue.prototype.$nextTick = function (fn) {
        return nextTick(fn, this)
    };

    Vue.prototype._render = function () {
        var vm = this;
        var ref = vm.$options;
        var render = ref.render;
        var _parentVnode = ref._parentVnode;

        if (_parentVnode) {
            vm.$scopedSlots = normalizeScopedSlots(
                _parentVnode.data.scopedSlots,
                vm.$slots,
                vm.$scopedSlots
            );
        }

        // set parent vnode. this allows render functions to have access
        // to the data on the placeholder node.
        vm.$vnode = _parentVnode;
        // render self
        var vnode;
        try {
            // There's no need to maintain a stack becaues all render fns are called
            // separately from one another. Nested component's render fns are called
            // when parent component is patched.
            currentRenderingInstance = vm;
            vnode = render.call(vm._renderProxy, vm.$createElement);
        } catch (e) {
            handleError(e, vm, "render");
            // return error render result,
            // or previous vnode to prevent render error causing blank component
            /* istanbul ignore else */
            if (vm.$options.renderError) {
                try {
                    vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                } catch (e) {
                    handleError(e, vm, "renderError");
                    vnode = vm._vnode;
                }
            } else {
                vnode = vm._vnode;
            }
        } finally {
            currentRenderingInstance = null;
        }
        // if the returned array contains only a single node, allow it
        if (Array.isArray(vnode) && vnode.length === 1) {
            vnode = vnode[0];
        }
        // return empty vnode in case the render function errored out
        if (!(vnode instanceof VNode)) {
            if (Array.isArray(vnode)) {
                warn(
                    'Multiple root nodes returned from render function. Render function ' +
                    'should return a single root node.',
                    vm
                );
            }
            vnode = createEmptyVNode();
        }
        // set parent
        vnode.parent = _parentVnode;
        return vnode
    };
}

/*  */

function ensureCtor (comp, base) {
    if (
        comp.__esModule ||
        (hasSymbol && comp[Symbol.toStringTag] === 'Module')
    ) {
        comp = comp.default;
    }
    return isObject(comp)
        ? base.extend(comp)
        : comp
}

function createAsyncPlaceholder (
    factory,
    data,
    context,
    children,
    tag
) {
    var node = createEmptyVNode();
    node.asyncFactory = factory;
    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
    return node
}

function resolveAsyncComponent (
    factory,
    baseCtor
) {
    if (isTrue(factory.error) && isDef(factory.errorComp)) {
        return factory.errorComp
    }

    if (isDef(factory.resolved)) {
        return factory.resolved
    }

    var owner = currentRenderingInstance;
    if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
        // already pending
        factory.owners.push(owner);
    }

    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
        return factory.loadingComp
    }

    if (owner && !isDef(factory.owners)) {
        var owners = factory.owners = [owner];
        var sync = true;
        var timerLoading = null;
        var timerTimeout = null

        ;(owner).$on('hook:destroyed', function () { return remove(owners, owner); });

        var forceRender = function (renderCompleted) {
            for (var i = 0, l = owners.length; i < l; i++) {
                (owners[i]).$forceUpdate();
            }

            if (renderCompleted) {
                owners.length = 0;
                if (timerLoading !== null) {
                    clearTimeout(timerLoading);
                    timerLoading = null;
                }
                if (timerTimeout !== null) {
                    clearTimeout(timerTimeout);
                    timerTimeout = null;
                }
            }
        };

        var resolve = once(function (res) {
            // cache resolved
            factory.resolved = ensureCtor(res, baseCtor);
            // invoke callbacks only if this is not a synchronous resolve
            // (async resolves are shimmed as synchronous during SSR)
            if (!sync) {
                forceRender(true);
            } else {
                owners.length = 0;
            }
        });

        var reject = once(function (reason) {
            warn(
                "Failed to resolve async component: " + (String(factory)) +
                (reason ? ("\nReason: " + reason) : '')
            );
            if (isDef(factory.errorComp)) {
                factory.error = true;
                forceRender(true);
            }
        });

        var res = factory(resolve, reject);

        if (isObject(res)) {
            if (isPromise(res)) {
                // () => Promise
                if (isUndef(factory.resolved)) {
                    res.then(resolve, reject);
                }
            } else if (isPromise(res.component)) {
                res.component.then(resolve, reject);

                if (isDef(res.error)) {
                    factory.errorComp = ensureCtor(res.error, baseCtor);
                }

                if (isDef(res.loading)) {
                    factory.loadingComp = ensureCtor(res.loading, baseCtor);
                    if (res.delay === 0) {
                        factory.loading = true;
                    } else {
                        timerLoading = setTimeout(function () {
                            timerLoading = null;
                            if (isUndef(factory.resolved) && isUndef(factory.error)) {
                                factory.loading = true;
                                forceRender(false);
                            }
                        }, res.delay || 200);
                    }
                }

                if (isDef(res.timeout)) {
                    timerTimeout = setTimeout(function () {
                        timerTimeout = null;
                        if (isUndef(factory.resolved)) {
                            reject(
                                "timeout (" + (res.timeout) + "ms)"
                            );
                        }
                    }, res.timeout);
                }
            }
        }

        sync = false;
        // return in case resolved synchronously
        return factory.loading
            ? factory.loadingComp
            : factory.resolved
    }
}

/*  */

function isAsyncPlaceholder (node) {
    return node.isComment && node.asyncFactory
}

/*  */

function getFirstComponentChild (children) {
    if (Array.isArray(children)) {
        for (var i = 0; i < children.length; i++) {
            var c = children[i];
            if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                return c
            }
        }
    }
}

/*  */

/*  */

function initEvents (vm) {
    vm._events = Object.create(null);
    vm._hasHookEvent = false;
    // init parent attached events
    var listeners = vm.$options._parentListeners;
    if (listeners) {
        updateComponentListeners(vm, listeners);
    }
}

var target;

function add (event, fn) {
    target.$on(event, fn);
}

function remove$1 (event, fn) {
    target.$off(event, fn);
}

function createOnceHandler (event, fn) {
    var _target = target;
    return function onceHandler () {
        var res = fn.apply(null, arguments);
        if (res !== null) {
            _target.$off(event, onceHandler);
        }
    }
}

function updateComponentListeners (
    vm,
    listeners,
    oldListeners
) {
    target = vm;
    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
    target = undefined;
}

function eventsMixin (Vue) {
    var hookRE = /^hook:/;
    Vue.prototype.$on = function (event, fn) {
        var vm = this;
        if (Array.isArray(event)) {
            for (var i = 0, l = event.length; i < l; i++) {
                vm.$on(event[i], fn);
            }
        } else {
            (vm._events[event] || (vm._events[event] = [])).push(fn);
            // optimize hook:event cost by using a boolean flag marked at registration
            // instead of a hash lookup
            if (hookRE.test(event)) {
                vm._hasHookEvent = true;
            }
        }
        return vm
    };

    Vue.prototype.$once = function (event, fn) {
        var vm = this;
        function on () {
            vm.$off(event, on);
            fn.apply(vm, arguments);
        }
        on.fn = fn;
        vm.$on(event, on);
        return vm
    };

    Vue.prototype.$off = function (event, fn) {
        var vm = this;
        // all
        if (!arguments.length) {
            vm._events = Object.create(null);
            return vm
        }
        // array of events
        if (Array.isArray(event)) {
            for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
                vm.$off(event[i$1], fn);
            }
            return vm
        }
        // specific event
        var cbs = vm._events[event];
        if (!cbs) {
            return vm
        }
        if (!fn) {
            vm._events[event] = null;
            return vm
        }
        // specific handler
        var cb;
        var i = cbs.length;
        while (i--) {
            cb = cbs[i];
            if (cb === fn || cb.fn === fn) {
                cbs.splice(i, 1);
                break
            }
        }
        return vm
    };

    Vue.prototype.$emit = function (event) {
        var vm = this;
        {
            var lowerCaseEvent = event.toLowerCase();
            if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                tip(
                    "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                    (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                    "Note that HTML attributes are case-insensitive and you cannot use " +
                    "v-on to listen to camelCase events when using in-DOM templates. " +
                    "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                );
            }
        }
        var cbs = vm._events[event];
        if (cbs) {
            cbs = cbs.length > 1 ? toArray(cbs) : cbs;
            var args = toArray(arguments, 1);
            var info = "event handler for \"" + event + "\"";
            for (var i = 0, l = cbs.length; i < l; i++) {
                invokeWithErrorHandling(cbs[i], vm, args, vm, info);
            }
        }
        return vm
    };
}

/*  */

var activeInstance = null;
var isUpdatingChildComponent = false;

function setActiveInstance(vm) {
    var prevActiveInstance = activeInstance;
    activeInstance = vm;
    return function () {
        activeInstance = prevActiveInstance;
    }
}

function initLifecycle (vm) {
    var options = vm.$options;

    // locate first non-abstract parent
    var parent = options.parent;
    if (parent && !options.abstract) {
        while (parent.$options.abstract && parent.$parent) {
            parent = parent.$parent;
        }
        parent.$children.push(vm);
    }

    vm.$parent = parent;
    vm.$root = parent ? parent.$root : vm;

    vm.$children = [];
    vm.$refs = {};

    vm._watcher = null;
    vm._inactive = null;
    vm._directInactive = false;
    vm._isMounted = false;
    vm._isDestroyed = false;
    vm._isBeingDestroyed = false;
}

function lifecycleMixin (Vue) {
    Vue.prototype._update = function (vnode, hydrating) {
        var vm = this;
        var prevEl = vm.$el;
        var prevVnode = vm._vnode;
        var restoreActiveInstance = setActiveInstance(vm);
        vm._vnode = vnode;
        // Vue.prototype.__patch__ is injected in entry points
        // based on the rendering backend used.
        if (!prevVnode) {
            // initial render
            vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
        } else {
            // updates
            vm.$el = vm.__patch__(prevVnode, vnode);
        }
        restoreActiveInstance();
        // update __vue__ reference
        if (prevEl) {
            prevEl.__vue__ = null;
        }
        if (vm.$el) {
            vm.$el.__vue__ = vm;
        }
        // if parent is an HOC, update its $el as well
        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
            vm.$parent.$el = vm.$el;
        }
        // updated hook is called by the scheduler to ensure that children are
        // updated in a parent's updated hook.
    };

    Vue.prototype.$forceUpdate = function () {
        var vm = this;
        if (vm._watcher) {
            vm._watcher.update();
        }
    };

    Vue.prototype.$destroy = function () {
        var vm = this;
        if (vm._isBeingDestroyed) {
            return
        }
        callHook(vm, 'beforeDestroy');
        vm._isBeingDestroyed = true;
        // remove self from parent
        var parent = vm.$parent;
        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
            remove(parent.$children, vm);
        }
        // teardown watchers
        if (vm._watcher) {
            vm._watcher.teardown();
        }
        var i = vm._watchers.length;
        while (i--) {
            vm._watchers[i].teardown();
        }
        // remove reference from data ob
        // frozen object may not have observer.
        if (vm._data.__ob__) {
            vm._data.__ob__.vmCount--;
        }
        // call the last hook...
        vm._isDestroyed = true;
        // invoke destroy hooks on current rendered tree
        vm.__patch__(vm._vnode, null);
        // fire destroyed hook
        callHook(vm, 'destroyed');
        // turn off all instance listeners.
        vm.$off();
        // remove __vue__ reference
        if (vm.$el) {
            vm.$el.__vue__ = null;
        }
        // release circular reference (#6759)
        if (vm.$vnode) {
            vm.$vnode.parent = null;
        }
    };
}

function mountComponent (
    vm,
    el,
    hydrating
) {
    vm.$el = el;
    if (!vm.$options.render) {
        vm.$options.render = createEmptyVNode;
        {
            /* istanbul ignore if */
            if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                vm.$options.el || el) {
                warn(
                    'You are using the runtime-only build of Vue where the template ' +
                    'compiler is not available. Either pre-compile the templates into ' +
                    'render functions, or use the compiler-included build.',
                    vm
                );
            } else {
                warn(
                    'Failed to mount component: template or render function not defined.',
                    vm
                );
            }
        }
    }
    callHook(vm, 'beforeMount');

    var updateComponent;
    /* istanbul ignore if */
    if (config.performance && mark) {
        updateComponent = function () {
            var name = vm._name;
            var id = vm._uid;
            var startTag = "vue-perf-start:" + id;
            var endTag = "vue-perf-end:" + id;

            mark(startTag);
            var vnode = vm._render();
            mark(endTag);
            measure(("vue " + name + " render"), startTag, endTag);

            mark(startTag);
            vm._update(vnode, hydrating);
            mark(endTag);
            measure(("vue " + name + " patch"), startTag, endTag);
        };
    } else {
        updateComponent = function () {
            vm._update(vm._render(), hydrating);
        };
    }

    // we set this to vm._watcher inside the watcher's constructor
    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
    // component's mounted hook), which relies on vm._watcher being already defined
    new Watcher(vm, updateComponent, noop, {
        before: function before () {
            if (vm._isMounted && !vm._isDestroyed) {
                callHook(vm, 'beforeUpdate');
            }
        }
    }, true /* isRenderWatcher */);
    hydrating = false;

    // manually mounted instance, call mounted on self
    // mounted is called for render-created child components in its inserted hook
    if (vm.$vnode == null) {
        vm._isMounted = true;
        callHook(vm, 'mounted');
    }
    return vm
}

function updateChildComponent (
    vm,
    propsData,
    listeners,
    parentVnode,
    renderChildren
) {
    {
        isUpdatingChildComponent = true;
    }

    // determine whether component has slot children
    // we need to do this before overwriting $options._renderChildren.

    // check if there are dynamic scopedSlots (hand-written or compiled but with
    // dynamic slot names). Static scoped slots compiled from template has the
    // "$stable" marker.
    var newScopedSlots = parentVnode.data.scopedSlots;
    var oldScopedSlots = vm.$scopedSlots;
    var hasDynamicScopedSlot = !!(
        (newScopedSlots && !newScopedSlots.$stable) ||
        (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
        (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key)
    );

    // Any static slot children from the parent may have changed during parent's
    // update. Dynamic scoped slots may also have changed. In such cases, a forced
    // update is necessary to ensure correctness.
    var needsForceUpdate = !!(
        renderChildren ||               // has new static slots
        vm.$options._renderChildren ||  // has old static slots
        hasDynamicScopedSlot
    );

    vm.$options._parentVnode = parentVnode;
    vm.$vnode = parentVnode; // update vm's placeholder node without re-render

    if (vm._vnode) { // update child tree's parent
        vm._vnode.parent = parentVnode;
    }
    vm.$options._renderChildren = renderChildren;

    // update $attrs and $listeners hash
    // these are also reactive so they may trigger child update if the child
    // used them during render
    vm.$attrs = parentVnode.data.attrs || emptyObject;
    vm.$listeners = listeners || emptyObject;

    // update props
    if (propsData && vm.$options.props) {
        toggleObserving(false);
        var props = vm._props;
        var propKeys = vm.$options._propKeys || [];
        for (var i = 0; i < propKeys.length; i++) {
            var key = propKeys[i];
            var propOptions = vm.$options.props; // wtf flow?
            props[key] = validateProp(key, propOptions, propsData, vm);
        }
        toggleObserving(true);
        // keep a copy of raw propsData
        vm.$options.propsData = propsData;
    }

    // update listeners
    listeners = listeners || emptyObject;
    var oldListeners = vm.$options._parentListeners;
    vm.$options._parentListeners = listeners;
    updateComponentListeners(vm, listeners, oldListeners);

    // resolve slots + force update if has children
    if (needsForceUpdate) {
        vm.$slots = resolveSlots(renderChildren, parentVnode.context);
        vm.$forceUpdate();
    }

    {
        isUpdatingChildComponent = false;
    }
}

function isInInactiveTree (vm) {
    while (vm && (vm = vm.$parent)) {
        if (vm._inactive) { return true }
    }
    return false
}

function activateChildComponent (vm, direct) {
    if (direct) {
        vm._directInactive = false;
        if (isInInactiveTree(vm)) {
            return
        }
    } else if (vm._directInactive) {
        return
    }
    if (vm._inactive || vm._inactive === null) {
        vm._inactive = false;
        for (var i = 0; i < vm.$children.length; i++) {
            activateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'activated');
    }
}

function deactivateChildComponent (vm, direct) {
    if (direct) {
        vm._directInactive = true;
        if (isInInactiveTree(vm)) {
            return
        }
    }
    if (!vm._inactive) {
        vm._inactive = true;
        for (var i = 0; i < vm.$children.length; i++) {
            deactivateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'deactivated');
    }
}

function callHook (vm, hook) {
    // #7573 disable dep collection when invoking lifecycle hooks
    pushTarget();
    var handlers = vm.$options[hook];
    var info = hook + " hook";
    if (handlers) {
        for (var i = 0, j = handlers.length; i < j; i++) {
            invokeWithErrorHandling(handlers[i], vm, null, vm, info);
        }
    }
    if (vm._hasHookEvent) {
        vm.$emit('hook:' + hook);
    }
    popTarget();
}

/*  */

var MAX_UPDATE_COUNT = 100;

var queue = [];
var activatedChildren = [];
var has = {};
var circular = {};
var waiting = false;
var flushing = false;
var index = 0;

/**
 * Reset the scheduler's state.
 */
function resetSchedulerState () {
    index = queue.length = activatedChildren.length = 0;
    has = {};
    {
        circular = {};
    }
    waiting = flushing = false;
}

// Async edge case #6566 requires saving the timestamp when event listeners are
// attached. However, calling performance.now() has a perf overhead especially
// if the page has thousands of event listeners. Instead, we take a timestamp
// every time the scheduler flushes and use that for all event listeners
// attached during that flush.
var currentFlushTimestamp = 0;

// Async edge case fix requires storing an event listener's attach timestamp.
var getNow = Date.now;

// Determine what event timestamp the browser is using. Annoyingly, the
// timestamp can either be hi-res (relative to page load) or low-res
// (relative to UNIX epoch), so in order to compare time we have to use the
// same timestamp type when saving the flush timestamp.
// All IE versions use low-res event timestamps, and have problematic clock
// implementations (#9632)
if (inBrowser && !isIE) {
    var performance = window.performance;
    if (
        performance &&
        typeof performance.now === 'function' &&
        getNow() > document.createEvent('Event').timeStamp
    ) {
        // if the event timestamp, although evaluated AFTER the Date.now(), is
        // smaller than it, it means the event is using a hi-res timestamp,
        // and we need to use the hi-res version for event listener timestamps as
        // well.
        getNow = function () { return performance.now(); };
    }
}

/**
 * Flush both queues and run the watchers.
 */
function flushSchedulerQueue () {
    currentFlushTimestamp = getNow();
    flushing = true;
    var watcher, id;

    // Sort queue before flush.
    // This ensures that:
    // 1. Components are updated from parent to child. (because parent is always
    //    created before the child)
    // 2. A component's user watchers are run before its render watcher (because
    //    user watchers are created before the render watcher)
    // 3. If a component is destroyed during a parent component's watcher run,
    //    its watchers can be skipped.
    queue.sort(function (a, b) { return a.id - b.id; });

    // do not cache length because more watchers might be pushed
    // as we run existing watchers
    for (index = 0; index < queue.length; index++) {
        watcher = queue[index];
        if (watcher.before) {
            watcher.before();
        }
        id = watcher.id;
        has[id] = null;
        watcher.run();
        // in dev build, check and stop circular updates.
        if (has[id] != null) {
            circular[id] = (circular[id] || 0) + 1;
            if (circular[id] > MAX_UPDATE_COUNT) {
                warn(
                    'You may have an infinite update loop ' + (
                        watcher.user
                            ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                            : "in a component render function."
                    ),
                    watcher.vm
                );
                break
            }
        }
    }

    // keep copies of post queues before resetting state
    var activatedQueue = activatedChildren.slice();
    var updatedQueue = queue.slice();

    resetSchedulerState();

    // call component updated and activated hooks
    callActivatedHooks(activatedQueue);
    callUpdatedHooks(updatedQueue);

    // devtool hook
    /* istanbul ignore if */
    if (devtools && config.devtools) {
        devtools.emit('flush');
    }
}

function callUpdatedHooks (queue) {
    var i = queue.length;
    while (i--) {
        var watcher = queue[i];
        var vm = watcher.vm;
        if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
            callHook(vm, 'updated');
        }
    }
}

/**
 * Queue a kept-alive component that was activated during patch.
 * The queue will be processed after the entire tree has been patched.
 */
function queueActivatedComponent (vm) {
    // setting _inactive to false here so that a render function can
    // rely on checking whether it's in an inactive tree (e.g. router-view)
    vm._inactive = false;
    activatedChildren.push(vm);
}

function callActivatedHooks (queue) {
    for (var i = 0; i < queue.length; i++) {
        queue[i]._inactive = true;
        activateChildComponent(queue[i], true /* true */);
    }
}

/**
 * Push a watcher into the watcher queue.
 * Jobs with duplicate IDs will be skipped unless it's
 * pushed when the queue is being flushed.
 */
function queueWatcher (watcher) {
    var id = watcher.id;
    if (has[id] == null) {
        has[id] = true;
        if (!flushing) {
            queue.push(watcher);
        } else {
            // if already flushing, splice the watcher based on its id
            // if already past its id, it will be run next immediately.
            var i = queue.length - 1;
            while (i > index && queue[i].id > watcher.id) {
                i--;
            }
            queue.splice(i + 1, 0, watcher);
        }
        // queue the flush
        if (!waiting) {
            waiting = true;

            if (!config.async) {
                flushSchedulerQueue();
                return
            }
            nextTick(flushSchedulerQueue);
        }
    }
}

/*  */



var uid$2 = 0;

/**
 * A watcher parses an expression, collects dependencies,
 * and fires callback when the expression value changes.
 * This is used for both the $watch() api and directives.
 */
var Watcher = function Watcher (
    vm,
    expOrFn,
    cb,
    options,
    isRenderWatcher
) {
    this.vm = vm;
    if (isRenderWatcher) {
        vm._watcher = this;
    }
    vm._watchers.push(this);
    // options
    if (options) {
        this.deep = !!options.deep;
        this.user = !!options.user;
        this.lazy = !!options.lazy;
        this.sync = !!options.sync;
        this.before = options.before;
    } else {
        this.deep = this.user = this.lazy = this.sync = false;
    }
    this.cb = cb;
    this.id = ++uid$2; // uid for batching
    this.active = true;
    this.dirty = this.lazy; // for lazy watchers
    this.deps = [];
    this.newDeps = [];
    this.depIds = new _Set();
    this.newDepIds = new _Set();
    this.expression = expOrFn.toString();
    // parse expression for getter
    if (typeof expOrFn === 'function') {
        this.getter = expOrFn;
    } else {
        this.getter = parsePath(expOrFn);
        if (!this.getter) {
            this.getter = noop;
            warn(
                "Failed watching path: \"" + expOrFn + "\" " +
                'Watcher only accepts simple dot-delimited paths. ' +
                'For full control, use a function instead.',
                vm
            );
        }
    }
    this.value = this.lazy
        ? undefined
        : this.get();
};

/**
 * Evaluate the getter, and re-collect dependencies.
 */
Watcher.prototype.get = function get () {
    pushTarget(this);
    var value;
    var vm = this.vm;
    try {
        value = this.getter.call(vm, vm);
    } catch (e) {
        if (this.user) {
            handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
        } else {
            throw e
        }
    } finally {
        // "touch" every property so they are all tracked as
        // dependencies for deep watching
        if (this.deep) {
            traverse(value);
        }
        popTarget();
        this.cleanupDeps();
    }
    return value
};

/**
 * Add a dependency to this directive.
 */
Watcher.prototype.addDep = function addDep (dep) {
    var id = dep.id;
    if (!this.newDepIds.has(id)) {
        this.newDepIds.add(id);
        this.newDeps.push(dep);
        if (!this.depIds.has(id)) {
            dep.addSub(this);
        }
    }
};

/**
 * Clean up for dependency collection.
 */
Watcher.prototype.cleanupDeps = function cleanupDeps () {
    var i = this.deps.length;
    while (i--) {
        var dep = this.deps[i];
        if (!this.newDepIds.has(dep.id)) {
            dep.removeSub(this);
        }
    }
    var tmp = this.depIds;
    this.depIds = this.newDepIds;
    this.newDepIds = tmp;
    this.newDepIds.clear();
    tmp = this.deps;
    this.deps = this.newDeps;
    this.newDeps = tmp;
    this.newDeps.length = 0;
};

/**
 * Subscriber interface.
 * Will be called when a dependency changes.
 */
Watcher.prototype.update = function update () {
    /* istanbul ignore else */
    if (this.lazy) {
        this.dirty = true;
    } else if (this.sync) {
        this.run();
    } else {
        queueWatcher(this);
    }
};

/**
 * Scheduler job interface.
 * Will be called by the scheduler.
 */
Watcher.prototype.run = function run () {
    if (this.active) {
        var value = this.get();
        if (
            value !== this.value ||
            // Deep watchers and watchers on Object/Arrays should fire even
            // when the value is the same, because the value may
            // have mutated.
            isObject(value) ||
            this.deep
        ) {
            // set new value
            var oldValue = this.value;
            this.value = value;
            if (this.user) {
                try {
                    this.cb.call(this.vm, value, oldValue);
                } catch (e) {
                    handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
                }
            } else {
                this.cb.call(this.vm, value, oldValue);
            }
        }
    }
};

/**
 * Evaluate the value of the watcher.
 * This only gets called for lazy watchers.
 */
Watcher.prototype.evaluate = function evaluate () {
    this.value = this.get();
    this.dirty = false;
};

/**
 * Depend on all deps collected by this watcher.
 */
Watcher.prototype.depend = function depend () {
    var i = this.deps.length;
    while (i--) {
        this.deps[i].depend();
    }
};

/**
 * Remove self from all dependencies' subscriber list.
 */
Watcher.prototype.teardown = function teardown () {
    if (this.active) {
        // remove self from vm's watcher list
        // this is a somewhat expensive operation so we skip it
        // if the vm is being destroyed.
        if (!this.vm._isBeingDestroyed) {
            remove(this.vm._watchers, this);
        }
        var i = this.deps.length;
        while (i--) {
            this.deps[i].removeSub(this);
        }
        this.active = false;
    }
};

/*  */

var sharedPropertyDefinition = {
    enumerable: true,
    configurable: true,
    get: noop,
    set: noop
};

function proxy (target, sourceKey, key) {
    sharedPropertyDefinition.get = function proxyGetter () {
        return this[sourceKey][key]
    };
    sharedPropertyDefinition.set = function proxySetter (val) {
        this[sourceKey][key] = val;
    };
    Object.defineProperty(target, key, sharedPropertyDefinition);
}

function initState (vm) {
    vm._watchers = [];
    var opts = vm.$options;
    if (opts.props) { initProps(vm, opts.props); }
    if (opts.methods) { initMethods(vm, opts.methods); }
    if (opts.data) {
        initData(vm);
    } else {
        observe(vm._data = {}, true /* asRootData */);
    }
    if (opts.computed) { initComputed(vm, opts.computed); }
    if (opts.watch && opts.watch !== nativeWatch) {
        initWatch(vm, opts.watch);
    }
}

function initProps (vm, propsOptions) {
    var propsData = vm.$options.propsData || {};
    var props = vm._props = {};
    // cache prop keys so that future props updates can iterate using Array
    // instead of dynamic object key enumeration.
    var keys = vm.$options._propKeys = [];
    var isRoot = !vm.$parent;
    // root instance props should be converted
    if (!isRoot) {
        toggleObserving(false);
    }
    var loop = function ( key ) {
        keys.push(key);
        var value = validateProp(key, propsOptions, propsData, vm);
        /* istanbul ignore else */
        {
            var hyphenatedKey = hyphenate(key);
            if (isReservedAttribute(hyphenatedKey) ||
                config.isReservedAttr(hyphenatedKey)) {
                warn(
                    ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                    vm
                );
            }
            defineReactive$$1(props, key, value, function () {
                if (!isRoot && !isUpdatingChildComponent) {
                    warn(
                        "Avoid mutating a prop directly since the value will be " +
                        "overwritten whenever the parent component re-renders. " +
                        "Instead, use a data or computed property based on the prop's " +
                        "value. Prop being mutated: \"" + key + "\"",
                        vm
                    );
                }
            });
        }
        // static props are already proxied on the component's prototype
        // during Vue.extend(). We only need to proxy props defined at
        // instantiation here.
        if (!(key in vm)) {
            proxy(vm, "_props", key);
        }
    };

    for (var key in propsOptions) loop( key );
    toggleObserving(true);
}

function initData (vm) {
    var data = vm.$options.data;
    data = vm._data = typeof data === 'function'
        ? getData(data, vm)
        : data || {};
    if (!isPlainObject(data)) {
        data = {};
        warn(
            'data functions should return an object:\n' +
            'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
            vm
        );
    }
    // proxy data on instance
    var keys = Object.keys(data);
    var props = vm.$options.props;
    var methods = vm.$options.methods;
    var i = keys.length;
    while (i--) {
        var key = keys[i];
        {
            if (methods && hasOwn(methods, key)) {
                warn(
                    ("Method \"" + key + "\" has already been defined as a data property."),
                    vm
                );
            }
        }
        if (props && hasOwn(props, key)) {
            warn(
                "The data property \"" + key + "\" is already declared as a prop. " +
                "Use prop default value instead.",
                vm
            );
        } else if (!isReserved(key)) {
            proxy(vm, "_data", key);
        }
    }
    // observe data
    observe(data, true /* asRootData */);
}

function getData (data, vm) {
    // #7573 disable dep collection when invoking data getters
    pushTarget();
    try {
        return data.call(vm, vm)
    } catch (e) {
        handleError(e, vm, "data()");
        return {}
    } finally {
        popTarget();
    }
}

var computedWatcherOptions = { lazy: true };

function initComputed (vm, computed) {
    // $flow-disable-line
    var watchers = vm._computedWatchers = Object.create(null);
    // computed properties are just getters during SSR
    var isSSR = isServerRendering();

    for (var key in computed) {
        var userDef = computed[key];
        var getter = typeof userDef === 'function' ? userDef : userDef.get;
        if (getter == null) {
            warn(
                ("Getter is missing for computed property \"" + key + "\"."),
                vm
            );
        }

        if (!isSSR) {
            // create internal watcher for the computed property.
            watchers[key] = new Watcher(
                vm,
                getter || noop,
                noop,
                computedWatcherOptions
            );
        }

        // component-defined computed properties are already defined on the
        // component prototype. We only need to define computed properties defined
        // at instantiation here.
        if (!(key in vm)) {
            defineComputed(vm, key, userDef);
        } else {
            if (key in vm.$data) {
                warn(("The computed property \"" + key + "\" is already defined in data."), vm);
            } else if (vm.$options.props && key in vm.$options.props) {
                warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
            }
        }
    }
}

function defineComputed (
    target,
    key,
    userDef
) {
    var shouldCache = !isServerRendering();
    if (typeof userDef === 'function') {
        sharedPropertyDefinition.get = shouldCache
            ? createComputedGetter(key)
            : createGetterInvoker(userDef);
        sharedPropertyDefinition.set = noop;
    } else {
        sharedPropertyDefinition.get = userDef.get
            ? shouldCache && userDef.cache !== false
                ? createComputedGetter(key)
                : createGetterInvoker(userDef.get)
            : noop;
        sharedPropertyDefinition.set = userDef.set || noop;
    }
    if (sharedPropertyDefinition.set === noop) {
        sharedPropertyDefinition.set = function () {
            warn(
                ("Computed property \"" + key + "\" was assigned to but it has no setter."),
                this
            );
        };
    }
    Object.defineProperty(target, key, sharedPropertyDefinition);
}

function createComputedGetter (key) {
    return function computedGetter () {
        var watcher = this._computedWatchers && this._computedWatchers[key];
        if (watcher) {
            if (watcher.dirty) {
                watcher.evaluate();
            }
            if (Dep.target) {
                watcher.depend();
            }
            return watcher.value
        }
    }
}

function createGetterInvoker(fn) {
    return function computedGetter () {
        return fn.call(this, this)
    }
}

function initMethods (vm, methods) {
    var props = vm.$options.props;
    for (var key in methods) {
        {
            if (typeof methods[key] !== 'function') {
                warn(
                    "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
                    "Did you reference the function correctly?",
                    vm
                );
            }
            if (props && hasOwn(props, key)) {
                warn(
                    ("Method \"" + key + "\" has already been defined as a prop."),
                    vm
                );
            }
            if ((key in vm) && isReserved(key)) {
                warn(
                    "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
                    "Avoid defining component methods that start with _ or $."
                );
            }
        }
        vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
    }
}

function initWatch (vm, watch) {
    for (var key in watch) {
        var handler = watch[key];
        if (Array.isArray(handler)) {
            for (var i = 0; i < handler.length; i++) {
                createWatcher(vm, key, handler[i]);
            }
        } else {
            createWatcher(vm, key, handler);
        }
    }
}

function createWatcher (
    vm,
    expOrFn,
    handler,
    options
) {
    if (isPlainObject(handler)) {
        options = handler;
        handler = handler.handler;
    }
    if (typeof handler === 'string') {
        handler = vm[handler];
    }
    return vm.$watch(expOrFn, handler, options)
}

function stateMixin (Vue) {
    // flow somehow has problems with directly declared definition object
    // when using Object.defineProperty, so we have to procedurally build up
    // the object here.
    var dataDef = {};
    dataDef.get = function () { return this._data };
    var propsDef = {};
    propsDef.get = function () { return this._props };
    {
        dataDef.set = function () {
            warn(
                'Avoid replacing instance root $data. ' +
                'Use nested data properties instead.',
                this
            );
        };
        propsDef.set = function () {
            warn("$props is readonly.", this);
        };
    }
    Object.defineProperty(Vue.prototype, '$data', dataDef);
    Object.defineProperty(Vue.prototype, '$props', propsDef);

    Vue.prototype.$set = set;
    Vue.prototype.$delete = del;

    Vue.prototype.$watch = function (
        expOrFn,
        cb,
        options
    ) {
        var vm = this;
        if (isPlainObject(cb)) {
            return createWatcher(vm, expOrFn, cb, options)
        }
        options = options || {};
        options.user = true;
        var watcher = new Watcher(vm, expOrFn, cb, options);
        if (options.immediate) {
            try {
                cb.call(vm, watcher.value);
            } catch (error) {
                handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
            }
        }
        return function unwatchFn () {
            watcher.teardown();
        }
    };
}

/*  */

var uid$3 = 0;

function initMixin (Vue) {
    Vue.prototype._init = function (options) {
        var vm = this;
        // a uid
        vm._uid = uid$3++;

        var startTag, endTag;
        /* istanbul ignore if */
        if (config.performance && mark) {
            startTag = "vue-perf-start:" + (vm._uid);
            endTag = "vue-perf-end:" + (vm._uid);
            mark(startTag);
        }

        // a flag to avoid this being observed
        vm._isVue = true;
        // merge options
        if (options && options._isComponent) {
            // optimize internal component instantiation
            // since dynamic options merging is pretty slow, and none of the
            // internal component options needs special treatment.
            initInternalComponent(vm, options);
        } else {
            vm.$options = mergeOptions(
                resolveConstructorOptions(vm.constructor),
                options || {},
                vm
            );
        }
        /* istanbul ignore else */
        {
            initProxy(vm);
        }
        // expose real self
        vm._self = vm;
        initLifecycle(vm);
        initEvents(vm);
        initRender(vm);
        callHook(vm, 'beforeCreate');
        initInjections(vm); // resolve injections before data/props
        initState(vm);
        initProvide(vm); // resolve provide after data/props
        callHook(vm, 'created');

        /* istanbul ignore if */
        if (config.performance && mark) {
            vm._name = formatComponentName(vm, false);
            mark(endTag);
            measure(("vue " + (vm._name) + " init"), startTag, endTag);
        }

        if (vm.$options.el) {
            vm.$mount(vm.$options.el);
        }
    };
}

function initInternalComponent (vm, options) {
    var opts = vm.$options = Object.create(vm.constructor.options);
    // doing this because it's faster than dynamic enumeration.
    var parentVnode = options._parentVnode;
    opts.parent = options.parent;
    opts._parentVnode = parentVnode;

    var vnodeComponentOptions = parentVnode.componentOptions;
    opts.propsData = vnodeComponentOptions.propsData;
    opts._parentListeners = vnodeComponentOptions.listeners;
    opts._renderChildren = vnodeComponentOptions.children;
    opts._componentTag = vnodeComponentOptions.tag;

    if (options.render) {
        opts.render = options.render;
        opts.staticRenderFns = options.staticRenderFns;
    }
}

function resolveConstructorOptions (Ctor) {
    var options = Ctor.options;
    if (Ctor.super) {
        var superOptions = resolveConstructorOptions(Ctor.super);
        var cachedSuperOptions = Ctor.superOptions;
        if (superOptions !== cachedSuperOptions) {
            // super option changed,
            // need to resolve new options.
            Ctor.superOptions = superOptions;
            // check if there are any late-modified/attached options (#4976)
            var modifiedOptions = resolveModifiedOptions(Ctor);
            // update base extend options
            if (modifiedOptions) {
                extend(Ctor.extendOptions, modifiedOptions);
            }
            options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
            if (options.name) {
                options.components[options.name] = Ctor;
            }
        }
    }
    return options
}

function resolveModifiedOptions (Ctor) {
    var modified;
    var latest = Ctor.options;
    var sealed = Ctor.sealedOptions;
    for (var key in latest) {
        if (latest[key] !== sealed[key]) {
            if (!modified) { modified = {}; }
            modified[key] = latest[key];
        }
    }
    return modified
}

function Vue (options) {
    if (!(this instanceof Vue)
    ) {
        warn('Vue is a constructor and should be called with the `new` keyword');
    }
    this._init(options);
}

initMixin(Vue);
stateMixin(Vue);
eventsMixin(Vue);
lifecycleMixin(Vue);
renderMixin(Vue);

/*  */

function initUse (Vue) {
    Vue.use = function (plugin) {
        var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
        if (installedPlugins.indexOf(plugin) > -1) {
            return this
        }

        // additional parameters
        var args = toArray(arguments, 1);
        args.unshift(this);
        if (typeof plugin.install === 'function') {
            plugin.install.apply(plugin, args);
        } else if (typeof plugin === 'function') {
            plugin.apply(null, args);
        }
        installedPlugins.push(plugin);
        return this
    };
}

/*  */

function initMixin$1 (Vue) {
    Vue.mixin = function (mixin) {
        this.options = mergeOptions(this.options, mixin);
        return this
    };
}

/*  */

function initExtend (Vue) {
    /**
     * Each instance constructor, including Vue, has a unique
     * cid. This enables us to create wrapped "child
     * constructors" for prototypal inheritance and cache them.
     */
    Vue.cid = 0;
    var cid = 1;

    /**
     * Class inheritance
     */
    Vue.extend = function (extendOptions) {
        extendOptions = extendOptions || {};
        var Super = this;
        var SuperId = Super.cid;
        var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
        if (cachedCtors[SuperId]) {
            return cachedCtors[SuperId]
        }

        var name = extendOptions.name || Super.options.name;
        if (name) {
            validateComponentName(name);
        }

        var Sub = function VueComponent (options) {
            this._init(options);
        };
        Sub.prototype = Object.create(Super.prototype);
        Sub.prototype.constructor = Sub;
        Sub.cid = cid++;
        Sub.options = mergeOptions(
            Super.options,
            extendOptions
        );
        Sub['super'] = Super;

        // For props and computed properties, we define the proxy getters on
        // the Vue instances at extension time, on the extended prototype. This
        // avoids Object.defineProperty calls for each instance created.
        if (Sub.options.props) {
            initProps$1(Sub);
        }
        if (Sub.options.computed) {
            initComputed$1(Sub);
        }

        // allow further extension/mixin/plugin usage
        Sub.extend = Super.extend;
        Sub.mixin = Super.mixin;
        Sub.use = Super.use;

        // create asset registers, so extended classes
        // can have their private assets too.
        ASSET_TYPES.forEach(function (type) {
            Sub[type] = Super[type];
        });
        // enable recursive self-lookup
        if (name) {
            Sub.options.components[name] = Sub;
        }

        // keep a reference to the super options at extension time.
        // later at instantiation we can check if Super's options have
        // been updated.
        Sub.superOptions = Super.options;
        Sub.extendOptions = extendOptions;
        Sub.sealedOptions = extend({}, Sub.options);

        // cache constructor
        cachedCtors[SuperId] = Sub;
        return Sub
    };
}

function initProps$1 (Comp) {
    var props = Comp.options.props;
    for (var key in props) {
        proxy(Comp.prototype, "_props", key);
    }
}

function initComputed$1 (Comp) {
    var computed = Comp.options.computed;
    for (var key in computed) {
        defineComputed(Comp.prototype, key, computed[key]);
    }
}

/*  */

function initAssetRegisters (Vue) {
    /**
     * Create asset registration methods.
     */
    ASSET_TYPES.forEach(function (type) {
        Vue[type] = function (
            id,
            definition
        ) {
            if (!definition) {
                return this.options[type + 's'][id]
            } else {
                /* istanbul ignore if */
                if (type === 'component') {
                    validateComponentName(id);
                }
                if (type === 'component' && isPlainObject(definition)) {
                    definition.name = definition.name || id;
                    definition = this.options._base.extend(definition);
                }
                if (type === 'directive' && typeof definition === 'function') {
                    definition = { bind: definition, update: definition };
                }
                this.options[type + 's'][id] = definition;
                return definition
            }
        };
    });
}

/*  */



function getComponentName (opts) {
    return opts && (opts.Ctor.options.name || opts.tag)
}

function matches (pattern, name) {
    if (Array.isArray(pattern)) {
        return pattern.indexOf(name) > -1
    } else if (typeof pattern === 'string') {
        return pattern.split(',').indexOf(name) > -1
    } else if (isRegExp(pattern)) {
        return pattern.test(name)
    }
    /* istanbul ignore next */
    return false
}

function pruneCache (keepAliveInstance, filter) {
    var cache = keepAliveInstance.cache;
    var keys = keepAliveInstance.keys;
    var _vnode = keepAliveInstance._vnode;
    for (var key in cache) {
        var cachedNode = cache[key];
        if (cachedNode) {
            var name = getComponentName(cachedNode.componentOptions);
            if (name && !filter(name)) {
                pruneCacheEntry(cache, key, keys, _vnode);
            }
        }
    }
}

function pruneCacheEntry (
    cache,
    key,
    keys,
    current
) {
    var cached$$1 = cache[key];
    if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
        cached$$1.componentInstance.$destroy();
    }
    cache[key] = null;
    remove(keys, key);
}

var patternTypes = [String, RegExp, Array];

var KeepAlive = {
    name: 'keep-alive',
    abstract: true,

    props: {
        include: patternTypes,
        exclude: patternTypes,
        max: [String, Number]
    },

    created: function created () {
        this.cache = Object.create(null);
        this.keys = [];
    },

    destroyed: function destroyed () {
        for (var key in this.cache) {
            pruneCacheEntry(this.cache, key, this.keys);
        }
    },

    mounted: function mounted () {
        var this$1 = this;

        this.$watch('include', function (val) {
            pruneCache(this$1, function (name) { return matches(val, name); });
        });
        this.$watch('exclude', function (val) {
            pruneCache(this$1, function (name) { return !matches(val, name); });
        });
    },

    render: function render () {
        var slot = this.$slots.default;
        var vnode = getFirstComponentChild(slot);
        var componentOptions = vnode && vnode.componentOptions;
        if (componentOptions) {
            // check pattern
            var name = getComponentName(componentOptions);
            var ref = this;
            var include = ref.include;
            var exclude = ref.exclude;
            if (
                // not included
                (include && (!name || !matches(include, name))) ||
                // excluded
                (exclude && name && matches(exclude, name))
            ) {
                return vnode
            }

            var ref$1 = this;
            var cache = ref$1.cache;
            var keys = ref$1.keys;
            var key = vnode.key == null
                // same constructor may get registered as different local components
                // so cid alone is not enough (#3269)
                ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
                : vnode.key;
            if (cache[key]) {
                vnode.componentInstance = cache[key].componentInstance;
                // make current key freshest
                remove(keys, key);
                keys.push(key);
            } else {
                cache[key] = vnode;
                keys.push(key);
                // prune oldest entry
                if (this.max && keys.length > parseInt(this.max)) {
                    pruneCacheEntry(cache, keys[0], keys, this._vnode);
                }
            }

            vnode.data.keepAlive = true;
        }
        return vnode || (slot && slot[0])
    }
};

var builtInComponents = {
    KeepAlive: KeepAlive
};

/*  */

function initGlobalAPI (Vue) {
    // config
    var configDef = {};
    configDef.get = function () { return config; };
    {
        configDef.set = function () {
            warn(
                'Do not replace the Vue.config object, set individual fields instead.'
            );
        };
    }
    Object.defineProperty(Vue, 'config', configDef);

    // exposed util methods.
    // NOTE: these are not considered part of the public API - avoid relying on
    // them unless you are aware of the risk.
    Vue.util = {
        warn: warn,
        extend: extend,
        mergeOptions: mergeOptions,
        defineReactive: defineReactive$$1
    };

    Vue.set = set;
    Vue.delete = del;
    Vue.nextTick = nextTick;

    // 2.6 explicit observable API
    Vue.observable = function (obj) {
        observe(obj);
        return obj
    };

    Vue.options = Object.create(null);
    ASSET_TYPES.forEach(function (type) {
        Vue.options[type + 's'] = Object.create(null);
    });

    // this is used to identify the "base" constructor to extend all plain-object
    // components with in Weex's multi-instance scenarios.
    Vue.options._base = Vue;

    extend(Vue.options.components, builtInComponents);

    initUse(Vue);
    initMixin$1(Vue);
    initExtend(Vue);
    initAssetRegisters(Vue);
}

initGlobalAPI(Vue);

Object.defineProperty(Vue.prototype, '$isServer', {
    get: isServerRendering
});

Object.defineProperty(Vue.prototype, '$ssrContext', {
    get: function get () {
        /* istanbul ignore next */
        return this.$vnode && this.$vnode.ssrContext
    }
});

// expose FunctionalRenderContext for ssr runtime helper installation
Object.defineProperty(Vue, 'FunctionalRenderContext', {
    value: FunctionalRenderContext
});

Vue.version = '2.6.10';

/*  */

// these are reserved for web because they are directly compiled away
// during template compilation
var isReservedAttr = makeMap('style,class');

// attributes that should be using props for binding
var acceptValue = makeMap('input,textarea,option,select,progress');
var mustUseProp = function (tag, type, attr) {
    return (
        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
        (attr === 'selected' && tag === 'option') ||
        (attr === 'checked' && tag === 'input') ||
        (attr === 'muted' && tag === 'video')
    )
};

var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');

var convertEnumeratedValue = function (key, value) {
    return isFalsyAttrValue(value) || value === 'false'
        ? 'false'
        // allow arbitrary string value for contenteditable
        : key === 'contenteditable' && isValidContentEditableValue(value)
            ? value
            : 'true'
};

var isBooleanAttr = makeMap(
    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
    'required,reversed,scoped,seamless,selected,sortable,translate,' +
    'truespeed,typemustmatch,visible'
);

var xlinkNS = 'http://www.w3.org/1999/xlink';

var isXlink = function (name) {
    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
};

var getXlinkProp = function (name) {
    return isXlink(name) ? name.slice(6, name.length) : ''
};

var isFalsyAttrValue = function (val) {
    return val == null || val === false
};

/*  */

function genClassForVnode (vnode) {
    var data = vnode.data;
    var parentNode = vnode;
    var childNode = vnode;
    while (isDef(childNode.componentInstance)) {
        childNode = childNode.componentInstance._vnode;
        if (childNode && childNode.data) {
            data = mergeClassData(childNode.data, data);
        }
    }
    while (isDef(parentNode = parentNode.parent)) {
        if (parentNode && parentNode.data) {
            data = mergeClassData(data, parentNode.data);
        }
    }
    return renderClass(data.staticClass, data.class)
}

function mergeClassData (child, parent) {
    return {
        staticClass: concat(child.staticClass, parent.staticClass),
        class: isDef(child.class)
            ? [child.class, parent.class]
            : parent.class
    }
}

function renderClass (
    staticClass,
    dynamicClass
) {
    if (isDef(staticClass) || isDef(dynamicClass)) {
        return concat(staticClass, stringifyClass(dynamicClass))
    }
    /* istanbul ignore next */
    return ''
}

function concat (a, b) {
    return a ? b ? (a + ' ' + b) : a : (b || '')
}

function stringifyClass (value) {
    if (Array.isArray(value)) {
        return stringifyArray(value)
    }
    if (isObject(value)) {
        return stringifyObject(value)
    }
    if (typeof value === 'string') {
        return value
    }
    /* istanbul ignore next */
    return ''
}

function stringifyArray (value) {
    var res = '';
    var stringified;
    for (var i = 0, l = value.length; i < l; i++) {
        if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
            if (res) { res += ' '; }
            res += stringified;
        }
    }
    return res
}

function stringifyObject (value) {
    var res = '';
    for (var key in value) {
        if (value[key]) {
            if (res) { res += ' '; }
            res += key;
        }
    }
    return res
}

/*  */

var namespaceMap = {
    svg: 'http://www.w3.org/2000/svg',
    math: 'http://www.w3.org/1998/Math/MathML'
};

var isHTMLTag = makeMap(
    'html,body,base,head,link,meta,style,title,' +
    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
    'embed,object,param,source,canvas,script,noscript,del,ins,' +
    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
    'output,progress,select,textarea,' +
    'details,dialog,menu,menuitem,summary,' +
    'content,element,shadow,template,blockquote,iframe,tfoot'
);

// this map is intentionally selective, only covering SVG elements that may
// contain child elements.
var isSVG = makeMap(
    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
    true
);

var isPreTag = function (tag) { return tag === 'pre'; };

var isReservedTag = function (tag) {
    return isHTMLTag(tag) || isSVG(tag)
};

function getTagNamespace (tag) {
    if (isSVG(tag)) {
        return 'svg'
    }
    // basic support for MathML
    // note it doesn't support other MathML elements being component roots
    if (tag === 'math') {
        return 'math'
    }
}

var unknownElementCache = Object.create(null);
function isUnknownElement (tag) {
    /* istanbul ignore if */
    if (!inBrowser) {
        return true
    }
    if (isReservedTag(tag)) {
        return false
    }
    tag = tag.toLowerCase();
    /* istanbul ignore if */
    if (unknownElementCache[tag] != null) {
        return unknownElementCache[tag]
    }
    var el = document.createElement(tag);
    if (tag.indexOf('-') > -1) {
        // http://stackoverflow.com/a/28210364/1070244
        return (unknownElementCache[tag] = (
            el.constructor === window.HTMLUnknownElement ||
            el.constructor === window.HTMLElement
        ))
    } else {
        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
    }
}

var isTextInputType = makeMap('text,number,password,search,email,tel,url');

/*  */

/**
 * Query an element selector if it's not an element already.
 */
function query (el) {
    if (typeof el === 'string') {
        var selected = document.querySelector(el);
        if (!selected) {
            warn(
                'Cannot find element: ' + el
            );
            return document.createElement('div')
        }
        return selected
    } else {
        return el
    }
}

/*  */

function createElement$1 (tagName, vnode) {
    var elm = document.createElement(tagName);
    if (tagName !== 'select') {
        return elm
    }
    // false or null will remove the attribute but undefined will not
    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
        elm.setAttribute('multiple', 'multiple');
    }
    return elm
}

function createElementNS (namespace, tagName) {
    return document.createElementNS(namespaceMap[namespace], tagName)
}

function createTextNode (text) {
    return document.createTextNode(text)
}

function createComment (text) {
    return document.createComment(text)
}

function insertBefore (parentNode, newNode, referenceNode) {
    parentNode.insertBefore(newNode, referenceNode);
}

function removeChild (node, child) {
    node.removeChild(child);
}

function appendChild (node, child) {
    node.appendChild(child);
}

function parentNode (node) {
    return node.parentNode
}

function nextSibling (node) {
    return node.nextSibling
}

function tagName (node) {
    return node.tagName
}

function setTextContent (node, text) {
    node.textContent = text;
}

function setStyleScope (node, scopeId) {
    node.setAttribute(scopeId, '');
}

var nodeOps = /*#__PURE__*/Object.freeze({
    createElement: createElement$1,
    createElementNS: createElementNS,
    createTextNode: createTextNode,
    createComment: createComment,
    insertBefore: insertBefore,
    removeChild: removeChild,
    appendChild: appendChild,
    parentNode: parentNode,
    nextSibling: nextSibling,
    tagName: tagName,
    setTextContent: setTextContent,
    setStyleScope: setStyleScope
});

/*  */

var ref = {
    create: function create (_, vnode) {
        registerRef(vnode);
    },
    update: function update (oldVnode, vnode) {
        if (oldVnode.data.ref !== vnode.data.ref) {
            registerRef(oldVnode, true);
            registerRef(vnode);
        }
    },
    destroy: function destroy (vnode) {
        registerRef(vnode, true);
    }
};

function registerRef (vnode, isRemoval) {
    var key = vnode.data.ref;
    if (!isDef(key)) { return }

    var vm = vnode.context;
    var ref = vnode.componentInstance || vnode.elm;
    var refs = vm.$refs;
    if (isRemoval) {
        if (Array.isArray(refs[key])) {
            remove(refs[key], ref);
        } else if (refs[key] === ref) {
            refs[key] = undefined;
        }
    } else {
        if (vnode.data.refInFor) {
            if (!Array.isArray(refs[key])) {
                refs[key] = [ref];
            } else if (refs[key].indexOf(ref) < 0) {
                // $flow-disable-line
                refs[key].push(ref);
            }
        } else {
            refs[key] = ref;
        }
    }
}

/**
 * Virtual DOM patching algorithm based on Snabbdom by
 * Simon Friis Vindum (@paldepind)
 * Licensed under the MIT License
 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
 *
 * modified by Evan You (@yyx990803)
 *
 * Not type-checking this because this file is perf-critical and the cost
 * of making flow understand it is not worth it.
 */

var emptyNode = new VNode('', {}, []);

var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

function sameVnode (a, b) {
    return (
        a.key === b.key && (
            (
                a.tag === b.tag &&
                a.isComment === b.isComment &&
                isDef(a.data) === isDef(b.data) &&
                sameInputType(a, b)
            ) || (
                isTrue(a.isAsyncPlaceholder) &&
                a.asyncFactory === b.asyncFactory &&
                isUndef(b.asyncFactory.error)
            )
        )
    )
}

function sameInputType (a, b) {
    if (a.tag !== 'input') { return true }
    var i;
    var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
    var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
}

function createKeyToOldIdx (children, beginIdx, endIdx) {
    var i, key;
    var map = {};
    for (i = beginIdx; i <= endIdx; ++i) {
        key = children[i].key;
        if (isDef(key)) { map[key] = i; }
    }
    return map
}

function createPatchFunction (backend) {
    var i, j;
    var cbs = {};

    var modules = backend.modules;
    var nodeOps = backend.nodeOps;

    for (i = 0; i < hooks.length; ++i) {
        cbs[hooks[i]] = [];
        for (j = 0; j < modules.length; ++j) {
            if (isDef(modules[j][hooks[i]])) {
                cbs[hooks[i]].push(modules[j][hooks[i]]);
            }
        }
    }

    function emptyNodeAt (elm) {
        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
    }

    function createRmCb (childElm, listeners) {
        function remove$$1 () {
            if (--remove$$1.listeners === 0) {
                removeNode(childElm);
            }
        }
        remove$$1.listeners = listeners;
        return remove$$1
    }

    function removeNode (el) {
        var parent = nodeOps.parentNode(el);
        // element may have already been removed due to v-html / v-text
        if (isDef(parent)) {
            nodeOps.removeChild(parent, el);
        }
    }

    function isUnknownElement$$1 (vnode, inVPre) {
        return (
            !inVPre &&
            !vnode.ns &&
            !(
                config.ignoredElements.length &&
                config.ignoredElements.some(function (ignore) {
                    return isRegExp(ignore)
                        ? ignore.test(vnode.tag)
                        : ignore === vnode.tag
                })
            ) &&
            config.isUnknownElement(vnode.tag)
        )
    }

    var creatingElmInVPre = 0;

    function createElm (
        vnode,
        insertedVnodeQueue,
        parentElm,
        refElm,
        nested,
        ownerArray,
        index
    ) {
        if (isDef(vnode.elm) && isDef(ownerArray)) {
            // This vnode was used in a previous render!
            // now it's used as a new node, overwriting its elm would cause
            // potential patch errors down the road when it's used as an insertion
            // reference node. Instead, we clone the node on-demand before creating
            // associated DOM element for it.
            vnode = ownerArray[index] = cloneVNode(vnode);
        }

        vnode.isRootInsert = !nested; // for transition enter check
        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
            return
        }

        var data = vnode.data;
        var children = vnode.children;
        var tag = vnode.tag;
        if (isDef(tag)) {
            {
                if (data && data.pre) {
                    creatingElmInVPre++;
                }
                if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                    warn(
                        'Unknown custom element: <' + tag + '> - did you ' +
                        'register the component correctly? For recursive components, ' +
                        'make sure to provide the "name" option.',
                        vnode.context
                    );
                }
            }

            vnode.elm = vnode.ns
                ? nodeOps.createElementNS(vnode.ns, tag)
                : nodeOps.createElement(tag, vnode);
            setScope(vnode);

            /* istanbul ignore if */
            {
                createChildren(vnode, children, insertedVnodeQueue);
                if (isDef(data)) {
                    invokeCreateHooks(vnode, insertedVnodeQueue);
                }
                insert(parentElm, vnode.elm, refElm);
            }

            if (data && data.pre) {
                creatingElmInVPre--;
            }
        } else if (isTrue(vnode.isComment)) {
            vnode.elm = nodeOps.createComment(vnode.text);
            insert(parentElm, vnode.elm, refElm);
        } else {
            vnode.elm = nodeOps.createTextNode(vnode.text);
            insert(parentElm, vnode.elm, refElm);
        }
    }

    function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
        var i = vnode.data;
        if (isDef(i)) {
            var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
            if (isDef(i = i.hook) && isDef(i = i.init)) {
                i(vnode, false /* hydrating */);
            }
            // after calling the init hook, if the vnode is a child component
            // it should've created a child instance and mounted it. the child
            // component also has set the placeholder vnode's elm.
            // in that case we can just return the element and be done.
            if (isDef(vnode.componentInstance)) {
                initComponent(vnode, insertedVnodeQueue);
                insert(parentElm, vnode.elm, refElm);
                if (isTrue(isReactivated)) {
                    reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                }
                return true
            }
        }
    }

    function initComponent (vnode, insertedVnodeQueue) {
        if (isDef(vnode.data.pendingInsert)) {
            insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
            vnode.data.pendingInsert = null;
        }
        vnode.elm = vnode.componentInstance.$el;
        if (isPatchable(vnode)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
            setScope(vnode);
        } else {
            // empty component root.
            // skip all element-related modules except for ref (#3455)
            registerRef(vnode);
            // make sure to invoke the insert hook
            insertedVnodeQueue.push(vnode);
        }
    }

    function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
        var i;
        // hack for #4339: a reactivated component with inner transition
        // does not trigger because the inner node's created hooks are not called
        // again. It's not ideal to involve module-specific logic in here but
        // there doesn't seem to be a better way to do it.
        var innerNode = vnode;
        while (innerNode.componentInstance) {
            innerNode = innerNode.componentInstance._vnode;
            if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                for (i = 0; i < cbs.activate.length; ++i) {
                    cbs.activate[i](emptyNode, innerNode);
                }
                insertedVnodeQueue.push(innerNode);
                break
            }
        }
        // unlike a newly created component,
        // a reactivated keep-alive component doesn't insert itself
        insert(parentElm, vnode.elm, refElm);
    }

    function insert (parent, elm, ref$$1) {
        if (isDef(parent)) {
            if (isDef(ref$$1)) {
                if (nodeOps.parentNode(ref$$1) === parent) {
                    nodeOps.insertBefore(parent, elm, ref$$1);
                }
            } else {
                nodeOps.appendChild(parent, elm);
            }
        }
    }

    function createChildren (vnode, children, insertedVnodeQueue) {
        if (Array.isArray(children)) {
            {
                checkDuplicateKeys(children);
            }
            for (var i = 0; i < children.length; ++i) {
                createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
            }
        } else if (isPrimitive(vnode.text)) {
            nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
        }
    }

    function isPatchable (vnode) {
        while (vnode.componentInstance) {
            vnode = vnode.componentInstance._vnode;
        }
        return isDef(vnode.tag)
    }

    function invokeCreateHooks (vnode, insertedVnodeQueue) {
        for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
            cbs.create[i$1](emptyNode, vnode);
        }
        i = vnode.data.hook; // Reuse variable
        if (isDef(i)) {
            if (isDef(i.create)) { i.create(emptyNode, vnode); }
            if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
        }
    }

    // set scope id attribute for scoped CSS.
    // this is implemented as a special case to avoid the overhead
    // of going through the normal attribute patching process.
    function setScope (vnode) {
        var i;
        if (isDef(i = vnode.fnScopeId)) {
            nodeOps.setStyleScope(vnode.elm, i);
        } else {
            var ancestor = vnode;
            while (ancestor) {
                if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                    nodeOps.setStyleScope(vnode.elm, i);
                }
                ancestor = ancestor.parent;
            }
        }
        // for slot content they should also get the scopeId from the host instance.
        if (isDef(i = activeInstance) &&
            i !== vnode.context &&
            i !== vnode.fnContext &&
            isDef(i = i.$options._scopeId)
        ) {
            nodeOps.setStyleScope(vnode.elm, i);
        }
    }

    function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
        for (; startIdx <= endIdx; ++startIdx) {
            createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
        }
    }

    function invokeDestroyHook (vnode) {
        var i, j;
        var data = vnode.data;
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
            for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
        }
        if (isDef(i = vnode.children)) {
            for (j = 0; j < vnode.children.length; ++j) {
                invokeDestroyHook(vnode.children[j]);
            }
        }
    }

    function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
        for (; startIdx <= endIdx; ++startIdx) {
            var ch = vnodes[startIdx];
            if (isDef(ch)) {
                if (isDef(ch.tag)) {
                    removeAndInvokeRemoveHook(ch);
                    invokeDestroyHook(ch);
                } else { // Text node
                    removeNode(ch.elm);
                }
            }
        }
    }

    function removeAndInvokeRemoveHook (vnode, rm) {
        if (isDef(rm) || isDef(vnode.data)) {
            var i;
            var listeners = cbs.remove.length + 1;
            if (isDef(rm)) {
                // we have a recursively passed down rm callback
                // increase the listeners count
                rm.listeners += listeners;
            } else {
                // directly removing
                rm = createRmCb(vnode.elm, listeners);
            }
            // recursively invoke hooks on child component root node
            if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                removeAndInvokeRemoveHook(i, rm);
            }
            for (i = 0; i < cbs.remove.length; ++i) {
                cbs.remove[i](vnode, rm);
            }
            if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                i(vnode, rm);
            } else {
                rm();
            }
        } else {
            removeNode(vnode.elm);
        }
    }

    function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
        var oldStartIdx = 0;
        var newStartIdx = 0;
        var oldEndIdx = oldCh.length - 1;
        var oldStartVnode = oldCh[0];
        var oldEndVnode = oldCh[oldEndIdx];
        var newEndIdx = newCh.length - 1;
        var newStartVnode = newCh[0];
        var newEndVnode = newCh[newEndIdx];
        var oldKeyToIdx, idxInOld, vnodeToMove, refElm;

        // removeOnly is a special flag used only by <transition-group>
        // to ensure removed elements stay in correct relative positions
        // during leaving transitions
        var canMove = !removeOnly;

        {
            checkDuplicateKeys(newCh);
        }

        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
            if (isUndef(oldStartVnode)) {
                oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
            } else if (isUndef(oldEndVnode)) {
                oldEndVnode = oldCh[--oldEndIdx];
            } else if (sameVnode(oldStartVnode, newStartVnode)) {
                patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                oldStartVnode = oldCh[++oldStartIdx];
                newStartVnode = newCh[++newStartIdx];
            } else if (sameVnode(oldEndVnode, newEndVnode)) {
                patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                oldEndVnode = oldCh[--oldEndIdx];
                newEndVnode = newCh[--newEndIdx];
            } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                oldStartVnode = oldCh[++oldStartIdx];
                newEndVnode = newCh[--newEndIdx];
            } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                oldEndVnode = oldCh[--oldEndIdx];
                newStartVnode = newCh[++newStartIdx];
            } else {
                if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
                idxInOld = isDef(newStartVnode.key)
                    ? oldKeyToIdx[newStartVnode.key]
                    : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                if (isUndef(idxInOld)) { // New element
                    createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                } else {
                    vnodeToMove = oldCh[idxInOld];
                    if (sameVnode(vnodeToMove, newStartVnode)) {
                        patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                        oldCh[idxInOld] = undefined;
                        canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                    } else {
                        // same key but different element. treat as new element
                        createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                    }
                }
                newStartVnode = newCh[++newStartIdx];
            }
        }
        if (oldStartIdx > oldEndIdx) {
            refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
            addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
        } else if (newStartIdx > newEndIdx) {
            removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
        }
    }

    function checkDuplicateKeys (children) {
        var seenKeys = {};
        for (var i = 0; i < children.length; i++) {
            var vnode = children[i];
            var key = vnode.key;
            if (isDef(key)) {
                if (seenKeys[key]) {
                    warn(
                        ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
                        vnode.context
                    );
                } else {
                    seenKeys[key] = true;
                }
            }
        }
    }

    function findIdxInOld (node, oldCh, start, end) {
        for (var i = start; i < end; i++) {
            var c = oldCh[i];
            if (isDef(c) && sameVnode(node, c)) { return i }
        }
    }

    function patchVnode (
        oldVnode,
        vnode,
        insertedVnodeQueue,
        ownerArray,
        index,
        removeOnly
    ) {
        if (oldVnode === vnode) {
            return
        }

        if (isDef(vnode.elm) && isDef(ownerArray)) {
            // clone reused vnode
            vnode = ownerArray[index] = cloneVNode(vnode);
        }

        var elm = vnode.elm = oldVnode.elm;

        if (isTrue(oldVnode.isAsyncPlaceholder)) {
            if (isDef(vnode.asyncFactory.resolved)) {
                hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
            } else {
                vnode.isAsyncPlaceholder = true;
            }
            return
        }

        // reuse element for static trees.
        // note we only do this if the vnode is cloned -
        // if the new node is not cloned it means the render functions have been
        // reset by the hot-reload-api and we need to do a proper re-render.
        if (isTrue(vnode.isStatic) &&
            isTrue(oldVnode.isStatic) &&
            vnode.key === oldVnode.key &&
            (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
        ) {
            vnode.componentInstance = oldVnode.componentInstance;
            return
        }

        var i;
        var data = vnode.data;
        if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
            i(oldVnode, vnode);
        }

        var oldCh = oldVnode.children;
        var ch = vnode.children;
        if (isDef(data) && isPatchable(vnode)) {
            for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
            if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
        }
        if (isUndef(vnode.text)) {
            if (isDef(oldCh) && isDef(ch)) {
                if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
            } else if (isDef(ch)) {
                {
                    checkDuplicateKeys(ch);
                }
                if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
                addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
            } else if (isDef(oldCh)) {
                removeVnodes(elm, oldCh, 0, oldCh.length - 1);
            } else if (isDef(oldVnode.text)) {
                nodeOps.setTextContent(elm, '');
            }
        } else if (oldVnode.text !== vnode.text) {
            nodeOps.setTextContent(elm, vnode.text);
        }
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
        }
    }

    function invokeInsertHook (vnode, queue, initial) {
        // delay insert hooks for component root nodes, invoke them after the
        // element is really inserted
        if (isTrue(initial) && isDef(vnode.parent)) {
            vnode.parent.data.pendingInsert = queue;
        } else {
            for (var i = 0; i < queue.length; ++i) {
                queue[i].data.hook.insert(queue[i]);
            }
        }
    }

    var hydrationBailed = false;
    // list of modules that can skip create hook during hydration because they
    // are already rendered on the client or has no need for initialization
    // Note: style is excluded because it relies on initial clone for future
    // deep updates (#7063).
    var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');

    // Note: this is a browser-only function so we can assume elms are DOM nodes.
    function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
        var i;
        var tag = vnode.tag;
        var data = vnode.data;
        var children = vnode.children;
        inVPre = inVPre || (data && data.pre);
        vnode.elm = elm;

        if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
            vnode.isAsyncPlaceholder = true;
            return true
        }
        // assert node match
        {
            if (!assertNodeMatch(elm, vnode, inVPre)) {
                return false
            }
        }
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
            if (isDef(i = vnode.componentInstance)) {
                // child component. it should have hydrated its own tree.
                initComponent(vnode, insertedVnodeQueue);
                return true
            }
        }
        if (isDef(tag)) {
            if (isDef(children)) {
                // empty element, allow client to pick up and populate children
                if (!elm.hasChildNodes()) {
                    createChildren(vnode, children, insertedVnodeQueue);
                } else {
                    // v-html and domProps: innerHTML
                    if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                        if (i !== elm.innerHTML) {
                            /* istanbul ignore if */
                            if (typeof console !== 'undefined' &&
                                !hydrationBailed
                            ) {
                                hydrationBailed = true;
                                console.warn('Parent: ', elm);
                                console.warn('server innerHTML: ', i);
                                console.warn('client innerHTML: ', elm.innerHTML);
                            }
                            return false
                        }
                    } else {
                        // iterate and compare children lists
                        var childrenMatch = true;
                        var childNode = elm.firstChild;
                        for (var i$1 = 0; i$1 < children.length; i$1++) {
                            if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
                                childrenMatch = false;
                                break
                            }
                            childNode = childNode.nextSibling;
                        }
                        // if childNode is not null, it means the actual childNodes list is
                        // longer than the virtual children list.
                        if (!childrenMatch || childNode) {
                            /* istanbul ignore if */
                            if (typeof console !== 'undefined' &&
                                !hydrationBailed
                            ) {
                                hydrationBailed = true;
                                console.warn('Parent: ', elm);
                                console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                            }
                            return false
                        }
                    }
                }
            }
            if (isDef(data)) {
                var fullInvoke = false;
                for (var key in data) {
                    if (!isRenderedModule(key)) {
                        fullInvoke = true;
                        invokeCreateHooks(vnode, insertedVnodeQueue);
                        break
                    }
                }
                if (!fullInvoke && data['class']) {
                    // ensure collecting deps for deep class bindings for future updates
                    traverse(data['class']);
                }
            }
        } else if (elm.data !== vnode.text) {
            elm.data = vnode.text;
        }
        return true
    }

    function assertNodeMatch (node, vnode, inVPre) {
        if (isDef(vnode.tag)) {
            return vnode.tag.indexOf('vue-component') === 0 || (
                !isUnknownElement$$1(vnode, inVPre) &&
                vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
            )
        } else {
            return node.nodeType === (vnode.isComment ? 8 : 3)
        }
    }

    return function patch (oldVnode, vnode, hydrating, removeOnly) {
        if (isUndef(vnode)) {
            if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
            return
        }

        var isInitialPatch = false;
        var insertedVnodeQueue = [];

        if (isUndef(oldVnode)) {
            // empty mount (likely as component), create new root element
            isInitialPatch = true;
            createElm(vnode, insertedVnodeQueue);
        } else {
            var isRealElement = isDef(oldVnode.nodeType);
            if (!isRealElement && sameVnode(oldVnode, vnode)) {
                // patch existing root node
                patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
            } else {
                if (isRealElement) {
                    // mounting to a real element
                    // check if this is server-rendered content and if we can perform
                    // a successful hydration.
                    if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                        oldVnode.removeAttribute(SSR_ATTR);
                        hydrating = true;
                    }
                    if (isTrue(hydrating)) {
                        if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                            invokeInsertHook(vnode, insertedVnodeQueue, true);
                            return oldVnode
                        } else {
                            warn(
                                'The client-side rendered virtual DOM tree is not matching ' +
                                'server-rendered content. This is likely caused by incorrect ' +
                                'HTML markup, for example nesting block-level elements inside ' +
                                '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                'full client-side render.'
                            );
                        }
                    }
                    // either not server-rendered, or hydration failed.
                    // create an empty node and replace it
                    oldVnode = emptyNodeAt(oldVnode);
                }

                // replacing existing element
                var oldElm = oldVnode.elm;
                var parentElm = nodeOps.parentNode(oldElm);

                // create new node
                createElm(
                    vnode,
                    insertedVnodeQueue,
                    // extremely rare edge case: do not insert if old element is in a
                    // leaving transition. Only happens when combining transition +
                    // keep-alive + HOCs. (#4590)
                    oldElm._leaveCb ? null : parentElm,
                    nodeOps.nextSibling(oldElm)
                );

                // update parent placeholder node element, recursively
                if (isDef(vnode.parent)) {
                    var ancestor = vnode.parent;
                    var patchable = isPatchable(vnode);
                    while (ancestor) {
                        for (var i = 0; i < cbs.destroy.length; ++i) {
                            cbs.destroy[i](ancestor);
                        }
                        ancestor.elm = vnode.elm;
                        if (patchable) {
                            for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                                cbs.create[i$1](emptyNode, ancestor);
                            }
                            // #6513
                            // invoke insert hooks that may have been merged by create hooks.
                            // e.g. for directives that uses the "inserted" hook.
                            var insert = ancestor.data.hook.insert;
                            if (insert.merged) {
                                // start at index 1 to avoid re-invoking component mounted hook
                                for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                                    insert.fns[i$2]();
                                }
                            }
                        } else {
                            registerRef(ancestor);
                        }
                        ancestor = ancestor.parent;
                    }
                }

                // destroy old node
                if (isDef(parentElm)) {
                    removeVnodes(parentElm, [oldVnode], 0, 0);
                } else if (isDef(oldVnode.tag)) {
                    invokeDestroyHook(oldVnode);
                }
            }
        }

        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
        return vnode.elm
    }
}

/*  */

var directives = {
    create: updateDirectives,
    update: updateDirectives,
    destroy: function unbindDirectives (vnode) {
        updateDirectives(vnode, emptyNode);
    }
};

function updateDirectives (oldVnode, vnode) {
    if (oldVnode.data.directives || vnode.data.directives) {
        _update(oldVnode, vnode);
    }
}

function _update (oldVnode, vnode) {
    var isCreate = oldVnode === emptyNode;
    var isDestroy = vnode === emptyNode;
    var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
    var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

    var dirsWithInsert = [];
    var dirsWithPostpatch = [];

    var key, oldDir, dir;
    for (key in newDirs) {
        oldDir = oldDirs[key];
        dir = newDirs[key];
        if (!oldDir) {
            // new directive, bind
            callHook$1(dir, 'bind', vnode, oldVnode);
            if (dir.def && dir.def.inserted) {
                dirsWithInsert.push(dir);
            }
        } else {
            // existing directive, update
            dir.oldValue = oldDir.value;
            dir.oldArg = oldDir.arg;
            callHook$1(dir, 'update', vnode, oldVnode);
            if (dir.def && dir.def.componentUpdated) {
                dirsWithPostpatch.push(dir);
            }
        }
    }

    if (dirsWithInsert.length) {
        var callInsert = function () {
            for (var i = 0; i < dirsWithInsert.length; i++) {
                callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
            }
        };
        if (isCreate) {
            mergeVNodeHook(vnode, 'insert', callInsert);
        } else {
            callInsert();
        }
    }

    if (dirsWithPostpatch.length) {
        mergeVNodeHook(vnode, 'postpatch', function () {
            for (var i = 0; i < dirsWithPostpatch.length; i++) {
                callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
            }
        });
    }

    if (!isCreate) {
        for (key in oldDirs) {
            if (!newDirs[key]) {
                // no longer present, unbind
                callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
            }
        }
    }
}

var emptyModifiers = Object.create(null);

function normalizeDirectives$1 (
    dirs,
    vm
) {
    var res = Object.create(null);
    if (!dirs) {
        // $flow-disable-line
        return res
    }
    var i, dir;
    for (i = 0; i < dirs.length; i++) {
        dir = dirs[i];
        if (!dir.modifiers) {
            // $flow-disable-line
            dir.modifiers = emptyModifiers;
        }
        res[getRawDirName(dir)] = dir;
        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
    }
    // $flow-disable-line
    return res
}

function getRawDirName (dir) {
    return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
}

function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
    var fn = dir.def && dir.def[hook];
    if (fn) {
        try {
            fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
        } catch (e) {
            handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
        }
    }
}

var baseModules = [
    ref,
    directives
];

/*  */

function updateAttrs (oldVnode, vnode) {
    var opts = vnode.componentOptions;
    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
        return
    }
    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
        return
    }
    var key, cur, old;
    var elm = vnode.elm;
    var oldAttrs = oldVnode.data.attrs || {};
    var attrs = vnode.data.attrs || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(attrs.__ob__)) {
        attrs = vnode.data.attrs = extend({}, attrs);
    }

    for (key in attrs) {
        cur = attrs[key];
        old = oldAttrs[key];
        if (old !== cur) {
            setAttr(elm, key, cur);
        }
    }
    // #4391: in IE9, setting type can reset value for input[type=radio]
    // #6666: IE/Edge forces progress value down to 1 before setting a max
    /* istanbul ignore if */
    if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
        setAttr(elm, 'value', attrs.value);
    }
    for (key in oldAttrs) {
        if (isUndef(attrs[key])) {
            if (isXlink(key)) {
                elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
            } else if (!isEnumeratedAttr(key)) {
                elm.removeAttribute(key);
            }
        }
    }
}

function setAttr (el, key, value) {
    if (el.tagName.indexOf('-') > -1) {
        baseSetAttr(el, key, value);
    } else if (isBooleanAttr(key)) {
        // set attribute for blank value
        // e.g. <option disabled>Select one</option>
        if (isFalsyAttrValue(value)) {
            el.removeAttribute(key);
        } else {
            // technically allowfullscreen is a boolean attribute for <iframe>,
            // but Flash expects a value of "true" when used on <embed> tag
            value = key === 'allowfullscreen' && el.tagName === 'EMBED'
                ? 'true'
                : key;
            el.setAttribute(key, value);
        }
    } else if (isEnumeratedAttr(key)) {
        el.setAttribute(key, convertEnumeratedValue(key, value));
    } else if (isXlink(key)) {
        if (isFalsyAttrValue(value)) {
            el.removeAttributeNS(xlinkNS, getXlinkProp(key));
        } else {
            el.setAttributeNS(xlinkNS, key, value);
        }
    } else {
        baseSetAttr(el, key, value);
    }
}

function baseSetAttr (el, key, value) {
    if (isFalsyAttrValue(value)) {
        el.removeAttribute(key);
    } else {
        // #7138: IE10 & 11 fires input event when setting placeholder on
        // <textarea>... block the first input event and remove the blocker
        // immediately.
        /* istanbul ignore if */
        if (
            isIE && !isIE9 &&
            el.tagName === 'TEXTAREA' &&
            key === 'placeholder' && value !== '' && !el.__ieph
        ) {
            var blocker = function (e) {
                e.stopImmediatePropagation();
                el.removeEventListener('input', blocker);
            };
            el.addEventListener('input', blocker);
            // $flow-disable-line
            el.__ieph = true; /* IE placeholder patched */
        }
        el.setAttribute(key, value);
    }
}

var attrs = {
    create: updateAttrs,
    update: updateAttrs
};

/*  */

function updateClass (oldVnode, vnode) {
    var el = vnode.elm;
    var data = vnode.data;
    var oldData = oldVnode.data;
    if (
        isUndef(data.staticClass) &&
        isUndef(data.class) && (
            isUndef(oldData) || (
                isUndef(oldData.staticClass) &&
                isUndef(oldData.class)
            )
        )
    ) {
        return
    }

    var cls = genClassForVnode(vnode);

    // handle transition classes
    var transitionClass = el._transitionClasses;
    if (isDef(transitionClass)) {
        cls = concat(cls, stringifyClass(transitionClass));
    }

    // set the class
    if (cls !== el._prevClass) {
        el.setAttribute('class', cls);
        el._prevClass = cls;
    }
}

var klass = {
    create: updateClass,
    update: updateClass
};

/*  */

var validDivisionCharRE = /[\w).+\-_$\]]/;

function parseFilters (exp) {
    var inSingle = false;
    var inDouble = false;
    var inTemplateString = false;
    var inRegex = false;
    var curly = 0;
    var square = 0;
    var paren = 0;
    var lastFilterIndex = 0;
    var c, prev, i, expression, filters;

    for (i = 0; i < exp.length; i++) {
        prev = c;
        c = exp.charCodeAt(i);
        if (inSingle) {
            if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
        } else if (inDouble) {
            if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
        } else if (inTemplateString) {
            if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
        } else if (inRegex) {
            if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
        } else if (
            c === 0x7C && // pipe
            exp.charCodeAt(i + 1) !== 0x7C &&
            exp.charCodeAt(i - 1) !== 0x7C &&
            !curly && !square && !paren
        ) {
            if (expression === undefined) {
                // first filter, end of expression
                lastFilterIndex = i + 1;
                expression = exp.slice(0, i).trim();
            } else {
                pushFilter();
            }
        } else {
            switch (c) {
                case 0x22: inDouble = true; break         // "
                case 0x27: inSingle = true; break         // '
                case 0x60: inTemplateString = true; break // `
                case 0x28: paren++; break                 // (
                case 0x29: paren--; break                 // )
                case 0x5B: square++; break                // [
                case 0x5D: square--; break                // ]
                case 0x7B: curly++; break                 // {
                case 0x7D: curly--; break                 // }
            }
            if (c === 0x2f) { // /
                var j = i - 1;
                var p = (void 0);
                // find first non-whitespace prev char
                for (; j >= 0; j--) {
                    p = exp.charAt(j);
                    if (p !== ' ') { break }
                }
                if (!p || !validDivisionCharRE.test(p)) {
                    inRegex = true;
                }
            }
        }
    }

    if (expression === undefined) {
        expression = exp.slice(0, i).trim();
    } else if (lastFilterIndex !== 0) {
        pushFilter();
    }

    function pushFilter () {
        (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
        lastFilterIndex = i + 1;
    }

    if (filters) {
        for (i = 0; i < filters.length; i++) {
            expression = wrapFilter(expression, filters[i]);
        }
    }

    return expression
}

function wrapFilter (exp, filter) {
    var i = filter.indexOf('(');
    if (i < 0) {
        // _f: resolveFilter
        return ("_f(\"" + filter + "\")(" + exp + ")")
    } else {
        var name = filter.slice(0, i);
        var args = filter.slice(i + 1);
        return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
    }
}

/*  */



/* eslint-disable no-unused-vars */
function baseWarn (msg, range) {
    console.error(("[Vue compiler]: " + msg));
}
/* eslint-enable no-unused-vars */

function pluckModuleFunction (
    modules,
    key
) {
    return modules
        ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
        : []
}

function addProp (el, name, value, range, dynamic) {
    (el.props || (el.props = [])).push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
    el.plain = false;
}

function addAttr (el, name, value, range, dynamic) {
    var attrs = dynamic
        ? (el.dynamicAttrs || (el.dynamicAttrs = []))
        : (el.attrs || (el.attrs = []));
    attrs.push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
    el.plain = false;
}

// add a raw attr (use this in preTransforms)
function addRawAttr (el, name, value, range) {
    el.attrsMap[name] = value;
    el.attrsList.push(rangeSetItem({ name: name, value: value }, range));
}

function addDirective (
    el,
    name,
    rawName,
    value,
    arg,
    isDynamicArg,
    modifiers,
    range
) {
    (el.directives || (el.directives = [])).push(rangeSetItem({
        name: name,
        rawName: rawName,
        value: value,
        arg: arg,
        isDynamicArg: isDynamicArg,
        modifiers: modifiers
    }, range));
    el.plain = false;
}

function prependModifierMarker (symbol, name, dynamic) {
    return dynamic
        ? ("_p(" + name + ",\"" + symbol + "\")")
        : symbol + name // mark the event as captured
}

function addHandler (
    el,
    name,
    value,
    modifiers,
    important,
    warn,
    range,
    dynamic
) {
    modifiers = modifiers || emptyObject;
    // warn prevent and passive modifier
    /* istanbul ignore if */
    if (
        warn &&
        modifiers.prevent && modifiers.passive
    ) {
        warn(
            'passive and prevent can\'t be used together. ' +
            'Passive handler can\'t prevent default event.',
            range
        );
    }

    // normalize click.right and click.middle since they don't actually fire
    // this is technically browser-specific, but at least for now browsers are
    // the only target envs that have right/middle clicks.
    if (modifiers.right) {
        if (dynamic) {
            name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
        } else if (name === 'click') {
            name = 'contextmenu';
            delete modifiers.right;
        }
    } else if (modifiers.middle) {
        if (dynamic) {
            name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
        } else if (name === 'click') {
            name = 'mouseup';
        }
    }

    // check capture modifier
    if (modifiers.capture) {
        delete modifiers.capture;
        name = prependModifierMarker('!', name, dynamic);
    }
    if (modifiers.once) {
        delete modifiers.once;
        name = prependModifierMarker('~', name, dynamic);
    }
    /* istanbul ignore if */
    if (modifiers.passive) {
        delete modifiers.passive;
        name = prependModifierMarker('&', name, dynamic);
    }

    var events;
    if (modifiers.native) {
        delete modifiers.native;
        events = el.nativeEvents || (el.nativeEvents = {});
    } else {
        events = el.events || (el.events = {});
    }

    var newHandler = rangeSetItem({ value: value.trim(), dynamic: dynamic }, range);
    if (modifiers !== emptyObject) {
        newHandler.modifiers = modifiers;
    }

    var handlers = events[name];
    /* istanbul ignore if */
    if (Array.isArray(handlers)) {
        important ? handlers.unshift(newHandler) : handlers.push(newHandler);
    } else if (handlers) {
        events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
    } else {
        events[name] = newHandler;
    }

    el.plain = false;
}

function getRawBindingAttr (
    el,
    name
) {
    return el.rawAttrsMap[':' + name] ||
        el.rawAttrsMap['v-bind:' + name] ||
        el.rawAttrsMap[name]
}

function getBindingAttr (
    el,
    name,
    getStatic
) {
    var dynamicValue =
        getAndRemoveAttr(el, ':' + name) ||
        getAndRemoveAttr(el, 'v-bind:' + name);
    if (dynamicValue != null) {
        return parseFilters(dynamicValue)
    } else if (getStatic !== false) {
        var staticValue = getAndRemoveAttr(el, name);
        if (staticValue != null) {
            return JSON.stringify(staticValue)
        }
    }
}

// note: this only removes the attr from the Array (attrsList) so that it
// doesn't get processed by processAttrs.
// By default it does NOT remove it from the map (attrsMap) because the map is
// needed during codegen.
function getAndRemoveAttr (
    el,
    name,
    removeFromMap
) {
    var val;
    if ((val = el.attrsMap[name]) != null) {
        var list = el.attrsList;
        for (var i = 0, l = list.length; i < l; i++) {
            if (list[i].name === name) {
                list.splice(i, 1);
                break
            }
        }
    }
    if (removeFromMap) {
        delete el.attrsMap[name];
    }
    return val
}

function getAndRemoveAttrByRegex (
    el,
    name
) {
    var list = el.attrsList;
    for (var i = 0, l = list.length; i < l; i++) {
        var attr = list[i];
        if (name.test(attr.name)) {
            list.splice(i, 1);
            return attr
        }
    }
}

function rangeSetItem (
    item,
    range
) {
    if (range) {
        if (range.start != null) {
            item.start = range.start;
        }
        if (range.end != null) {
            item.end = range.end;
        }
    }
    return item
}

/*  */

/**
 * Cross-platform code generation for component v-model
 */
function genComponentModel (
    el,
    value,
    modifiers
) {
    var ref = modifiers || {};
    var number = ref.number;
    var trim = ref.trim;

    var baseValueExpression = '$$v';
    var valueExpression = baseValueExpression;
    if (trim) {
        valueExpression =
            "(typeof " + baseValueExpression + " === 'string'" +
            "? " + baseValueExpression + ".trim()" +
            ": " + baseValueExpression + ")";
    }
    if (number) {
        valueExpression = "_n(" + valueExpression + ")";
    }
    var assignment = genAssignmentCode(value, valueExpression);

    el.model = {
        value: ("(" + value + ")"),
        expression: JSON.stringify(value),
        callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
    };
}

/**
 * Cross-platform codegen helper for generating v-model value assignment code.
 */
function genAssignmentCode (
    value,
    assignment
) {
    var res = parseModel(value);
    if (res.key === null) {
        return (value + "=" + assignment)
    } else {
        return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
    }
}

/**
 * Parse a v-model expression into a base path and a final key segment.
 * Handles both dot-path and possible square brackets.
 *
 * Possible cases:
 *
 * - test
 * - test[key]
 * - test[test1[key]]
 * - test["a"][key]
 * - xxx.test[a[a].test1[key]]
 * - test.xxx.a["asa"][test1[key]]
 *
 */

var len, str, chr, index$1, expressionPos, expressionEndPos;



function parseModel (val) {
    // Fix https://github.com/vuejs/vue/pull/7730
    // allow v-model="obj.val " (trailing whitespace)
    val = val.trim();
    len = val.length;

    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
        index$1 = val.lastIndexOf('.');
        if (index$1 > -1) {
            return {
                exp: val.slice(0, index$1),
                key: '"' + val.slice(index$1 + 1) + '"'
            }
        } else {
            return {
                exp: val,
                key: null
            }
        }
    }

    str = val;
    index$1 = expressionPos = expressionEndPos = 0;

    while (!eof()) {
        chr = next();
        /* istanbul ignore if */
        if (isStringStart(chr)) {
            parseString(chr);
        } else if (chr === 0x5B) {
            parseBracket(chr);
        }
    }

    return {
        exp: val.slice(0, expressionPos),
        key: val.slice(expressionPos + 1, expressionEndPos)
    }
}

function next () {
    return str.charCodeAt(++index$1)
}

function eof () {
    return index$1 >= len
}

function isStringStart (chr) {
    return chr === 0x22 || chr === 0x27
}

function parseBracket (chr) {
    var inBracket = 1;
    expressionPos = index$1;
    while (!eof()) {
        chr = next();
        if (isStringStart(chr)) {
            parseString(chr);
            continue
        }
        if (chr === 0x5B) { inBracket++; }
        if (chr === 0x5D) { inBracket--; }
        if (inBracket === 0) {
            expressionEndPos = index$1;
            break
        }
    }
}

function parseString (chr) {
    var stringQuote = chr;
    while (!eof()) {
        chr = next();
        if (chr === stringQuote) {
            break
        }
    }
}

/*  */

var warn$1;

// in some cases, the event used has to be determined at runtime
// so we used some reserved tokens during compile.
var RANGE_TOKEN = '__r';
var CHECKBOX_RADIO_TOKEN = '__c';

function model (
    el,
    dir,
    _warn
) {
    warn$1 = _warn;
    var value = dir.value;
    var modifiers = dir.modifiers;
    var tag = el.tag;
    var type = el.attrsMap.type;

    {
        // inputs with type="file" are read only and setting the input's
        // value will throw an error.
        if (tag === 'input' && type === 'file') {
            warn$1(
                "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                "File inputs are read only. Use a v-on:change listener instead.",
                el.rawAttrsMap['v-model']
            );
        }
    }

    if (el.component) {
        genComponentModel(el, value, modifiers);
        // component v-model doesn't need extra runtime
        return false
    } else if (tag === 'select') {
        genSelect(el, value, modifiers);
    } else if (tag === 'input' && type === 'checkbox') {
        genCheckboxModel(el, value, modifiers);
    } else if (tag === 'input' && type === 'radio') {
        genRadioModel(el, value, modifiers);
    } else if (tag === 'input' || tag === 'textarea') {
        genDefaultModel(el, value, modifiers);
    } else if (!config.isReservedTag(tag)) {
        genComponentModel(el, value, modifiers);
        // component v-model doesn't need extra runtime
        return false
    } else {
        warn$1(
            "<" + (el.tag) + " v-model=\"" + value + "\">: " +
            "v-model is not supported on this element type. " +
            'If you are working with contenteditable, it\'s recommended to ' +
            'wrap a library dedicated for that purpose inside a custom component.',
            el.rawAttrsMap['v-model']
        );
    }

    // ensure runtime directive metadata
    return true
}

function genCheckboxModel (
    el,
    value,
    modifiers
) {
    var number = modifiers && modifiers.number;
    var valueBinding = getBindingAttr(el, 'value') || 'null';
    var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
    var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
    addProp(el, 'checked',
        "Array.isArray(" + value + ")" +
        "?_i(" + value + "," + valueBinding + ")>-1" + (
            trueValueBinding === 'true'
                ? (":(" + value + ")")
                : (":_q(" + value + "," + trueValueBinding + ")")
        )
    );
    addHandler(el, 'change',
        "var $$a=" + value + "," +
        '$$el=$event.target,' +
        "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
        'if(Array.isArray($$a)){' +
        "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
        '$$i=_i($$a,$$v);' +
        "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
        "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
        "}else{" + (genAssignmentCode(value, '$$c')) + "}",
        null, true
    );
}

function genRadioModel (
    el,
    value,
    modifiers
) {
    var number = modifiers && modifiers.number;
    var valueBinding = getBindingAttr(el, 'value') || 'null';
    valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
    addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
}

function genSelect (
    el,
    value,
    modifiers
) {
    var number = modifiers && modifiers.number;
    var selectedVal = "Array.prototype.filter" +
        ".call($event.target.options,function(o){return o.selected})" +
        ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
        "return " + (number ? '_n(val)' : 'val') + "})";

    var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
    var code = "var $$selectedVal = " + selectedVal + ";";
    code = code + " " + (genAssignmentCode(value, assignment));
    addHandler(el, 'change', code, null, true);
}

function genDefaultModel (
    el,
    value,
    modifiers
) {
    var type = el.attrsMap.type;

    // warn if v-bind:value conflicts with v-model
    // except for inputs with v-bind:type
    {
        var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
        var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
        if (value$1 && !typeBinding) {
            var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
            warn$1(
                binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
                'because the latter already expands to a value binding internally',
                el.rawAttrsMap[binding]
            );
        }
    }

    var ref = modifiers || {};
    var lazy = ref.lazy;
    var number = ref.number;
    var trim = ref.trim;
    var needCompositionGuard = !lazy && type !== 'range';
    var event = lazy
        ? 'change'
        : type === 'range'
            ? RANGE_TOKEN
            : 'input';

    var valueExpression = '$event.target.value';
    if (trim) {
        valueExpression = "$event.target.value.trim()";
    }
    if (number) {
        valueExpression = "_n(" + valueExpression + ")";
    }

    var code = genAssignmentCode(value, valueExpression);
    if (needCompositionGuard) {
        code = "if($event.target.composing)return;" + code;
    }

    addProp(el, 'value', ("(" + value + ")"));
    addHandler(el, event, code, null, true);
    if (trim || number) {
        addHandler(el, 'blur', '$forceUpdate()');
    }
}

/*  */

// normalize v-model event tokens that can only be determined at runtime.
// it's important to place the event as the first in the array because
// the whole point is ensuring the v-model callback gets called before
// user-attached handlers.
function normalizeEvents (on) {
    /* istanbul ignore if */
    if (isDef(on[RANGE_TOKEN])) {
        // IE input[type=range] only supports `change` event
        var event = isIE ? 'change' : 'input';
        on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
        delete on[RANGE_TOKEN];
    }
    // This was originally intended to fix #4521 but no longer necessary
    // after 2.5. Keeping it for backwards compat with generated code from < 2.4
    /* istanbul ignore if */
    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
        on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
        delete on[CHECKBOX_RADIO_TOKEN];
    }
}

var target$1;

function createOnceHandler$1 (event, handler, capture) {
    var _target = target$1; // save current target element in closure
    return function onceHandler () {
        var res = handler.apply(null, arguments);
        if (res !== null) {
            remove$2(event, onceHandler, capture, _target);
        }
    }
}

// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
// implementation and does not fire microtasks in between event propagation, so
// safe to exclude.
var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);

function add$1 (
    name,
    handler,
    capture,
    passive
) {
    // async edge case #6566: inner click event triggers patch, event handler
    // attached to outer element during patch, and triggered again. This
    // happens because browsers fire microtask ticks between event propagation.
    // the solution is simple: we save the timestamp when a handler is attached,
    // and the handler would only fire if the event passed to it was fired
    // AFTER it was attached.
    if (useMicrotaskFix) {
        var attachedTimestamp = currentFlushTimestamp;
        var original = handler;
        handler = original._wrapper = function (e) {
            if (
                // no bubbling, should always fire.
                // this is just a safety net in case event.timeStamp is unreliable in
                // certain weird environments...
                e.target === e.currentTarget ||
                // event is fired after handler attachment
                e.timeStamp >= attachedTimestamp ||
                // bail for environments that have buggy event.timeStamp implementations
                // #9462 iOS 9 bug: event.timeStamp is 0 after history.pushState
                // #9681 QtWebEngine event.timeStamp is negative value
                e.timeStamp <= 0 ||
                // #9448 bail if event is fired in another document in a multi-page
                // electron/nw.js app, since event.timeStamp will be using a different
                // starting reference
                e.target.ownerDocument !== document
            ) {
                return original.apply(this, arguments)
            }
        };
    }
    target$1.addEventListener(
        name,
        handler,
        supportsPassive
            ? { capture: capture, passive: passive }
            : capture
    );
}

function remove$2 (
    name,
    handler,
    capture,
    _target
) {
    (_target || target$1).removeEventListener(
        name,
        handler._wrapper || handler,
        capture
    );
}

function updateDOMListeners (oldVnode, vnode) {
    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
        return
    }
    var on = vnode.data.on || {};
    var oldOn = oldVnode.data.on || {};
    target$1 = vnode.elm;
    normalizeEvents(on);
    updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
    target$1 = undefined;
}

var events = {
    create: updateDOMListeners,
    update: updateDOMListeners
};

/*  */

var svgContainer;

function updateDOMProps (oldVnode, vnode) {
    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
        return
    }
    var key, cur;
    var elm = vnode.elm;
    var oldProps = oldVnode.data.domProps || {};
    var props = vnode.data.domProps || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(props.__ob__)) {
        props = vnode.data.domProps = extend({}, props);
    }

    for (key in oldProps) {
        if (!(key in props)) {
            elm[key] = '';
        }
    }

    for (key in props) {
        cur = props[key];
        // ignore children if the node has textContent or innerHTML,
        // as these will throw away existing DOM nodes and cause removal errors
        // on subsequent patches (#3360)
        if (key === 'textContent' || key === 'innerHTML') {
            if (vnode.children) { vnode.children.length = 0; }
            if (cur === oldProps[key]) { continue }
            // #6601 work around Chrome version <= 55 bug where single textNode
            // replaced by innerHTML/textContent retains its parentNode property
            if (elm.childNodes.length === 1) {
                elm.removeChild(elm.childNodes[0]);
            }
        }

        if (key === 'value' && elm.tagName !== 'PROGRESS') {
            // store value as _value as well since
            // non-string values will be stringified
            elm._value = cur;
            // avoid resetting cursor position when value is the same
            var strCur = isUndef(cur) ? '' : String(cur);
            if (shouldUpdateValue(elm, strCur)) {
                elm.value = strCur;
            }
        } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
            // IE doesn't support innerHTML for SVG elements
            svgContainer = svgContainer || document.createElement('div');
            svgContainer.innerHTML = "<svg>" + cur + "</svg>";
            var svg = svgContainer.firstChild;
            while (elm.firstChild) {
                elm.removeChild(elm.firstChild);
            }
            while (svg.firstChild) {
                elm.appendChild(svg.firstChild);
            }
        } else if (
            // skip the update if old and new VDOM state is the same.
            // `value` is handled separately because the DOM value may be temporarily
            // out of sync with VDOM state due to focus, composition and modifiers.
            // This  #4521 by skipping the unnecesarry `checked` update.
            cur !== oldProps[key]
        ) {
            // some property updates can throw
            // e.g. `value` on <progress> w/ non-finite value
            try {
                elm[key] = cur;
            } catch (e) {}
        }
    }
}

// check platforms/web/util/attrs.js acceptValue


function shouldUpdateValue (elm, checkVal) {
    return (!elm.composing && (
        elm.tagName === 'OPTION' ||
        isNotInFocusAndDirty(elm, checkVal) ||
        isDirtyWithModifiers(elm, checkVal)
    ))
}

function isNotInFocusAndDirty (elm, checkVal) {
    // return true when textbox (.number and .trim) loses focus and its value is
    // not equal to the updated value
    var notInFocus = true;
    // #6157
    // work around IE bug when accessing document.activeElement in an iframe
    try { notInFocus = document.activeElement !== elm; } catch (e) {}
    return notInFocus && elm.value !== checkVal
}

function isDirtyWithModifiers (elm, newVal) {
    var value = elm.value;
    var modifiers = elm._vModifiers; // injected by v-model runtime
    if (isDef(modifiers)) {
        if (modifiers.number) {
            return toNumber(value) !== toNumber(newVal)
        }
        if (modifiers.trim) {
            return value.trim() !== newVal.trim()
        }
    }
    return value !== newVal
}

var domProps = {
    create: updateDOMProps,
    update: updateDOMProps
};

/*  */

var parseStyleText = cached(function (cssText) {
    var res = {};
    var listDelimiter = /;(?![^(]*\))/g;
    var propertyDelimiter = /:(.+)/;
    cssText.split(listDelimiter).forEach(function (item) {
        if (item) {
            var tmp = item.split(propertyDelimiter);
            tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
        }
    });
    return res
});

// merge static and dynamic style data on the same vnode
function normalizeStyleData (data) {
    var style = normalizeStyleBinding(data.style);
    // static style is pre-processed into an object during compilation
    // and is always a fresh object, so it's safe to merge into it
    return data.staticStyle
        ? extend(data.staticStyle, style)
        : style
}

// normalize possible array / string values into Object
function normalizeStyleBinding (bindingStyle) {
    if (Array.isArray(bindingStyle)) {
        return toObject(bindingStyle)
    }
    if (typeof bindingStyle === 'string') {
        return parseStyleText(bindingStyle)
    }
    return bindingStyle
}

/**
 * parent component style should be after child's
 * so that parent component's style could override it
 */
function getStyle (vnode, checkChild) {
    var res = {};
    var styleData;

    if (checkChild) {
        var childNode = vnode;
        while (childNode.componentInstance) {
            childNode = childNode.componentInstance._vnode;
            if (
                childNode && childNode.data &&
                (styleData = normalizeStyleData(childNode.data))
            ) {
                extend(res, styleData);
            }
        }
    }

    if ((styleData = normalizeStyleData(vnode.data))) {
        extend(res, styleData);
    }

    var parentNode = vnode;
    while ((parentNode = parentNode.parent)) {
        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
            extend(res, styleData);
        }
    }
    return res
}

/*  */

var cssVarRE = /^--/;
var importantRE = /\s*!important$/;
var setProp = function (el, name, val) {
    /* istanbul ignore if */
    if (cssVarRE.test(name)) {
        el.style.setProperty(name, val);
    } else if (importantRE.test(val)) {
        el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
    } else {
        var normalizedName = normalize(name);
        if (Array.isArray(val)) {
            // Support values array created by autoprefixer, e.g.
            // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
            // Set them one by one, and the browser will only set those it can recognize
            for (var i = 0, len = val.length; i < len; i++) {
                el.style[normalizedName] = val[i];
            }
        } else {
            el.style[normalizedName] = val;
        }
    }
};

var vendorNames = ['Webkit', 'Moz', 'ms'];

var emptyStyle;
var normalize = cached(function (prop) {
    emptyStyle = emptyStyle || document.createElement('div').style;
    prop = camelize(prop);
    if (prop !== 'filter' && (prop in emptyStyle)) {
        return prop
    }
    var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
    for (var i = 0; i < vendorNames.length; i++) {
        var name = vendorNames[i] + capName;
        if (name in emptyStyle) {
            return name
        }
    }
});

function updateStyle (oldVnode, vnode) {
    var data = vnode.data;
    var oldData = oldVnode.data;

    if (isUndef(data.staticStyle) && isUndef(data.style) &&
        isUndef(oldData.staticStyle) && isUndef(oldData.style)
    ) {
        return
    }

    var cur, name;
    var el = vnode.elm;
    var oldStaticStyle = oldData.staticStyle;
    var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};

    // if static style exists, stylebinding already merged into it when doing normalizeStyleData
    var oldStyle = oldStaticStyle || oldStyleBinding;

    var style = normalizeStyleBinding(vnode.data.style) || {};

    // store normalized style under a different key for next diff
    // make sure to clone it if it's reactive, since the user likely wants
    // to mutate it.
    vnode.data.normalizedStyle = isDef(style.__ob__)
        ? extend({}, style)
        : style;

    var newStyle = getStyle(vnode, true);

    for (name in oldStyle) {
        if (isUndef(newStyle[name])) {
            setProp(el, name, '');
        }
    }
    for (name in newStyle) {
        cur = newStyle[name];
        if (cur !== oldStyle[name]) {
            // ie9 setting to null has no effect, must use empty string
            setProp(el, name, cur == null ? '' : cur);
        }
    }
}

var style = {
    create: updateStyle,
    update: updateStyle
};

/*  */

var whitespaceRE = /\s+/;

/**
 * Add class with compatibility for SVG since classList is not supported on
 * SVG elements in IE
 */
function addClass (el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
        return
    }

    /* istanbul ignore else */
    if (el.classList) {
        if (cls.indexOf(' ') > -1) {
            cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });
        } else {
            el.classList.add(cls);
        }
    } else {
        var cur = " " + (el.getAttribute('class') || '') + " ";
        if (cur.indexOf(' ' + cls + ' ') < 0) {
            el.setAttribute('class', (cur + cls).trim());
        }
    }
}

/**
 * Remove class with compatibility for SVG since classList is not supported on
 * SVG elements in IE
 */
function removeClass (el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
        return
    }

    /* istanbul ignore else */
    if (el.classList) {
        if (cls.indexOf(' ') > -1) {
            cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });
        } else {
            el.classList.remove(cls);
        }
        if (!el.classList.length) {
            el.removeAttribute('class');
        }
    } else {
        var cur = " " + (el.getAttribute('class') || '') + " ";
        var tar = ' ' + cls + ' ';
        while (cur.indexOf(tar) >= 0) {
            cur = cur.replace(tar, ' ');
        }
        cur = cur.trim();
        if (cur) {
            el.setAttribute('class', cur);
        } else {
            el.removeAttribute('class');
        }
    }
}

/*  */

function resolveTransition (def$$1) {
    if (!def$$1) {
        return
    }
    /* istanbul ignore else */
    if (typeof def$$1 === 'object') {
        var res = {};
        if (def$$1.css !== false) {
            extend(res, autoCssTransition(def$$1.name || 'v'));
        }
        extend(res, def$$1);
        return res
    } else if (typeof def$$1 === 'string') {
        return autoCssTransition(def$$1)
    }
}

var autoCssTransition = cached(function (name) {
    return {
        enterClass: (name + "-enter"),
        enterToClass: (name + "-enter-to"),
        enterActiveClass: (name + "-enter-active"),
        leaveClass: (name + "-leave"),
        leaveToClass: (name + "-leave-to"),
        leaveActiveClass: (name + "-leave-active")
    }
});

var hasTransition = inBrowser && !isIE9;
var TRANSITION = 'transition';
var ANIMATION = 'animation';

// Transition property/event sniffing
var transitionProp = 'transition';
var transitionEndEvent = 'transitionend';
var animationProp = 'animation';
var animationEndEvent = 'animationend';
if (hasTransition) {
    /* istanbul ignore if */
    if (window.ontransitionend === undefined &&
        window.onwebkittransitionend !== undefined
    ) {
        transitionProp = 'WebkitTransition';
        transitionEndEvent = 'webkitTransitionEnd';
    }
    if (window.onanimationend === undefined &&
        window.onwebkitanimationend !== undefined
    ) {
        animationProp = 'WebkitAnimation';
        animationEndEvent = 'webkitAnimationEnd';
    }
}

// binding to window is necessary to make hot reload work in IE in strict mode
var raf = inBrowser
    ? window.requestAnimationFrame
        ? window.requestAnimationFrame.bind(window)
        : setTimeout
    : /* istanbul ignore next */ function (fn) { return fn(); };

function nextFrame (fn) {
    raf(function () {
        raf(fn);
    });
}

function addTransitionClass (el, cls) {
    var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
    if (transitionClasses.indexOf(cls) < 0) {
        transitionClasses.push(cls);
        addClass(el, cls);
    }
}

function removeTransitionClass (el, cls) {
    if (el._transitionClasses) {
        remove(el._transitionClasses, cls);
    }
    removeClass(el, cls);
}

function whenTransitionEnds (
    el,
    expectedType,
    cb
) {
    var ref = getTransitionInfo(el, expectedType);
    var type = ref.type;
    var timeout = ref.timeout;
    var propCount = ref.propCount;
    if (!type) { return cb() }
    var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
    var ended = 0;
    var end = function () {
        el.removeEventListener(event, onEnd);
        cb();
    };
    var onEnd = function (e) {
        if (e.target === el) {
            if (++ended >= propCount) {
                end();
            }
        }
    };
    setTimeout(function () {
        if (ended < propCount) {
            end();
        }
    }, timeout + 1);
    el.addEventListener(event, onEnd);
}

var transformRE = /\b(transform|all)(,|$)/;

function getTransitionInfo (el, expectedType) {
    var styles = window.getComputedStyle(el);
    // JSDOM may return undefined for transition properties
    var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
    var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
    var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
    var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
    var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
    var animationTimeout = getTimeout(animationDelays, animationDurations);

    var type;
    var timeout = 0;
    var propCount = 0;
    /* istanbul ignore if */
    if (expectedType === TRANSITION) {
        if (transitionTimeout > 0) {
            type = TRANSITION;
            timeout = transitionTimeout;
            propCount = transitionDurations.length;
        }
    } else if (expectedType === ANIMATION) {
        if (animationTimeout > 0) {
            type = ANIMATION;
            timeout = animationTimeout;
            propCount = animationDurations.length;
        }
    } else {
        timeout = Math.max(transitionTimeout, animationTimeout);
        type = timeout > 0
            ? transitionTimeout > animationTimeout
                ? TRANSITION
                : ANIMATION
            : null;
        propCount = type
            ? type === TRANSITION
                ? transitionDurations.length
                : animationDurations.length
            : 0;
    }
    var hasTransform =
        type === TRANSITION &&
        transformRE.test(styles[transitionProp + 'Property']);
    return {
        type: type,
        timeout: timeout,
        propCount: propCount,
        hasTransform: hasTransform
    }
}

function getTimeout (delays, durations) {
    /* istanbul ignore next */
    while (delays.length < durations.length) {
        delays = delays.concat(delays);
    }

    return Math.max.apply(null, durations.map(function (d, i) {
        return toMs(d) + toMs(delays[i])
    }))
}

// Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
// in a locale-dependent way, using a comma instead of a dot.
// If comma is not replaced with a dot, the input will be rounded down (i.e. acting
// as a floor function) causing unexpected behaviors
function toMs (s) {
    return Number(s.slice(0, -1).replace(',', '.')) * 1000
}

/*  */

function enter (vnode, toggleDisplay) {
    var el = vnode.elm;

    // call leave callback now
    if (isDef(el._leaveCb)) {
        el._leaveCb.cancelled = true;
        el._leaveCb();
    }

    var data = resolveTransition(vnode.data.transition);
    if (isUndef(data)) {
        return
    }

    /* istanbul ignore if */
    if (isDef(el._enterCb) || el.nodeType !== 1) {
        return
    }

    var css = data.css;
    var type = data.type;
    var enterClass = data.enterClass;
    var enterToClass = data.enterToClass;
    var enterActiveClass = data.enterActiveClass;
    var appearClass = data.appearClass;
    var appearToClass = data.appearToClass;
    var appearActiveClass = data.appearActiveClass;
    var beforeEnter = data.beforeEnter;
    var enter = data.enter;
    var afterEnter = data.afterEnter;
    var enterCancelled = data.enterCancelled;
    var beforeAppear = data.beforeAppear;
    var appear = data.appear;
    var afterAppear = data.afterAppear;
    var appearCancelled = data.appearCancelled;
    var duration = data.duration;

    // activeInstance will always be the <transition> component managing this
    // transition. One edge case to check is when the <transition> is placed
    // as the root node of a child component. In that case we need to check
    // <transition>'s parent for appear check.
    var context = activeInstance;
    var transitionNode = activeInstance.$vnode;
    while (transitionNode && transitionNode.parent) {
        context = transitionNode.context;
        transitionNode = transitionNode.parent;
    }

    var isAppear = !context._isMounted || !vnode.isRootInsert;

    if (isAppear && !appear && appear !== '') {
        return
    }

    var startClass = isAppear && appearClass
        ? appearClass
        : enterClass;
    var activeClass = isAppear && appearActiveClass
        ? appearActiveClass
        : enterActiveClass;
    var toClass = isAppear && appearToClass
        ? appearToClass
        : enterToClass;

    var beforeEnterHook = isAppear
        ? (beforeAppear || beforeEnter)
        : beforeEnter;
    var enterHook = isAppear
        ? (typeof appear === 'function' ? appear : enter)
        : enter;
    var afterEnterHook = isAppear
        ? (afterAppear || afterEnter)
        : afterEnter;
    var enterCancelledHook = isAppear
        ? (appearCancelled || enterCancelled)
        : enterCancelled;

    var explicitEnterDuration = toNumber(
        isObject(duration)
            ? duration.enter
            : duration
    );

    if (explicitEnterDuration != null) {
        checkDuration(explicitEnterDuration, 'enter', vnode);
    }

    var expectsCSS = css !== false && !isIE9;
    var userWantsControl = getHookArgumentsLength(enterHook);

    var cb = el._enterCb = once(function () {
        if (expectsCSS) {
            removeTransitionClass(el, toClass);
            removeTransitionClass(el, activeClass);
        }
        if (cb.cancelled) {
            if (expectsCSS) {
                removeTransitionClass(el, startClass);
            }
            enterCancelledHook && enterCancelledHook(el);
        } else {
            afterEnterHook && afterEnterHook(el);
        }
        el._enterCb = null;
    });

    if (!vnode.data.show) {
        // remove pending leave element on enter by injecting an insert hook
        mergeVNodeHook(vnode, 'insert', function () {
            var parent = el.parentNode;
            var pendingNode = parent && parent._pending && parent._pending[vnode.key];
            if (pendingNode &&
                pendingNode.tag === vnode.tag &&
                pendingNode.elm._leaveCb
            ) {
                pendingNode.elm._leaveCb();
            }
            enterHook && enterHook(el, cb);
        });
    }

    // start enter transition
    beforeEnterHook && beforeEnterHook(el);
    if (expectsCSS) {
        addTransitionClass(el, startClass);
        addTransitionClass(el, activeClass);
        nextFrame(function () {
            removeTransitionClass(el, startClass);
            if (!cb.cancelled) {
                addTransitionClass(el, toClass);
                if (!userWantsControl) {
                    if (isValidDuration(explicitEnterDuration)) {
                        setTimeout(cb, explicitEnterDuration);
                    } else {
                        whenTransitionEnds(el, type, cb);
                    }
                }
            }
        });
    }

    if (vnode.data.show) {
        toggleDisplay && toggleDisplay();
        enterHook && enterHook(el, cb);
    }

    if (!expectsCSS && !userWantsControl) {
        cb();
    }
}

function leave (vnode, rm) {
    var el = vnode.elm;

    // call enter callback now
    if (isDef(el._enterCb)) {
        el._enterCb.cancelled = true;
        el._enterCb();
    }

    var data = resolveTransition(vnode.data.transition);
    if (isUndef(data) || el.nodeType !== 1) {
        return rm()
    }

    /* istanbul ignore if */
    if (isDef(el._leaveCb)) {
        return
    }

    var css = data.css;
    var type = data.type;
    var leaveClass = data.leaveClass;
    var leaveToClass = data.leaveToClass;
    var leaveActiveClass = data.leaveActiveClass;
    var beforeLeave = data.beforeLeave;
    var leave = data.leave;
    var afterLeave = data.afterLeave;
    var leaveCancelled = data.leaveCancelled;
    var delayLeave = data.delayLeave;
    var duration = data.duration;

    var expectsCSS = css !== false && !isIE9;
    var userWantsControl = getHookArgumentsLength(leave);

    var explicitLeaveDuration = toNumber(
        isObject(duration)
            ? duration.leave
            : duration
    );

    if (isDef(explicitLeaveDuration)) {
        checkDuration(explicitLeaveDuration, 'leave', vnode);
    }

    var cb = el._leaveCb = once(function () {
        if (el.parentNode && el.parentNode._pending) {
            el.parentNode._pending[vnode.key] = null;
        }
        if (expectsCSS) {
            removeTransitionClass(el, leaveToClass);
            removeTransitionClass(el, leaveActiveClass);
        }
        if (cb.cancelled) {
            if (expectsCSS) {
                removeTransitionClass(el, leaveClass);
            }
            leaveCancelled && leaveCancelled(el);
        } else {
            rm();
            afterLeave && afterLeave(el);
        }
        el._leaveCb = null;
    });

    if (delayLeave) {
        delayLeave(performLeave);
    } else {
        performLeave();
    }

    function performLeave () {
        // the delayed leave may have already been cancelled
        if (cb.cancelled) {
            return
        }
        // record leaving element
        if (!vnode.data.show && el.parentNode) {
            (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
        }
        beforeLeave && beforeLeave(el);
        if (expectsCSS) {
            addTransitionClass(el, leaveClass);
            addTransitionClass(el, leaveActiveClass);
            nextFrame(function () {
                removeTransitionClass(el, leaveClass);
                if (!cb.cancelled) {
                    addTransitionClass(el, leaveToClass);
                    if (!userWantsControl) {
                        if (isValidDuration(explicitLeaveDuration)) {
                            setTimeout(cb, explicitLeaveDuration);
                        } else {
                            whenTransitionEnds(el, type, cb);
                        }
                    }
                }
            });
        }
        leave && leave(el, cb);
        if (!expectsCSS && !userWantsControl) {
            cb();
        }
    }
}

// only used in dev mode
function checkDuration (val, name, vnode) {
    if (typeof val !== 'number') {
        warn(
            "<transition> explicit " + name + " duration is not a valid number - " +
            "got " + (JSON.stringify(val)) + ".",
            vnode.context
        );
    } else if (isNaN(val)) {
        warn(
            "<transition> explicit " + name + " duration is NaN - " +
            'the duration expression might be incorrect.',
            vnode.context
        );
    }
}

function isValidDuration (val) {
    return typeof val === 'number' && !isNaN(val)
}

/**
 * Normalize a transition hook's argument length. The hook may be:
 * - a merged hook (invoker) with the original in .fns
 * - a wrapped component method (check ._length)
 * - a plain function (.length)
 */
function getHookArgumentsLength (fn) {
    if (isUndef(fn)) {
        return false
    }
    var invokerFns = fn.fns;
    if (isDef(invokerFns)) {
        // invoker
        return getHookArgumentsLength(
            Array.isArray(invokerFns)
                ? invokerFns[0]
                : invokerFns
        )
    } else {
        return (fn._length || fn.length) > 1
    }
}

function _enter (_, vnode) {
    if (vnode.data.show !== true) {
        enter(vnode);
    }
}

var transition = inBrowser ? {
    create: _enter,
    activate: _enter,
    remove: function remove$$1 (vnode, rm) {
        /* istanbul ignore else */
        if (vnode.data.show !== true) {
            leave(vnode, rm);
        } else {
            rm();
        }
    }
} : {};

var platformModules = [
    attrs,
    klass,
    events,
    domProps,
    style,
    transition
];

/*  */

// the directive module should be applied last, after all
// built-in modules have been applied.
var modules = platformModules.concat(baseModules);

var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });

/**
 * Not type checking this file because flow doesn't like attaching
 * properties to Elements.
 */

/* istanbul ignore if */
if (isIE9) {
    // http://www.matts411.com/post/internet-explorer-9-oninput/
    document.addEventListener('selectionchange', function () {
        var el = document.activeElement;
        if (el && el.vmodel) {
            trigger(el, 'input');
        }
    });
}

var directive = {
    inserted: function inserted (el, binding, vnode, oldVnode) {
        if (vnode.tag === 'select') {
            // #6903
            if (oldVnode.elm && !oldVnode.elm._vOptions) {
                mergeVNodeHook(vnode, 'postpatch', function () {
                    directive.componentUpdated(el, binding, vnode);
                });
            } else {
                setSelected(el, binding, vnode.context);
            }
            el._vOptions = [].map.call(el.options, getValue);
        } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
            el._vModifiers = binding.modifiers;
            if (!binding.modifiers.lazy) {
                el.addEventListener('compositionstart', onCompositionStart);
                el.addEventListener('compositionend', onCompositionEnd);
                // Safari < 10.2 & UIWebView doesn't fire compositionend when
                // switching focus before confirming composition choice
                // this also fixes the issue where some browsers e.g. iOS Chrome
                // fires "change" instead of "input" on autocomplete.
                el.addEventListener('change', onCompositionEnd);
                /* istanbul ignore if */
                if (isIE9) {
                    el.vmodel = true;
                }
            }
        }
    },

    componentUpdated: function componentUpdated (el, binding, vnode) {
        if (vnode.tag === 'select') {
            setSelected(el, binding, vnode.context);
            // in case the options rendered by v-for have changed,
            // it's possible that the value is out-of-sync with the rendered options.
            // detect such cases and filter out values that no longer has a matching
            // option in the DOM.
            var prevOptions = el._vOptions;
            var curOptions = el._vOptions = [].map.call(el.options, getValue);
            if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
                // trigger change event if
                // no matching option found for at least one value
                var needReset = el.multiple
                    ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
                    : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                if (needReset) {
                    trigger(el, 'change');
                }
            }
        }
    }
};

function setSelected (el, binding, vm) {
    actuallySetSelected(el, binding, vm);
    /* istanbul ignore if */
    if (isIE || isEdge) {
        setTimeout(function () {
            actuallySetSelected(el, binding, vm);
        }, 0);
    }
}

function actuallySetSelected (el, binding, vm) {
    var value = binding.value;
    var isMultiple = el.multiple;
    if (isMultiple && !Array.isArray(value)) {
        warn(
            "<select multiple v-model=\"" + (binding.expression) + "\"> " +
            "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
            vm
        );
        return
    }
    var selected, option;
    for (var i = 0, l = el.options.length; i < l; i++) {
        option = el.options[i];
        if (isMultiple) {
            selected = looseIndexOf(value, getValue(option)) > -1;
            if (option.selected !== selected) {
                option.selected = selected;
            }
        } else {
            if (looseEqual(getValue(option), value)) {
                if (el.selectedIndex !== i) {
                    el.selectedIndex = i;
                }
                return
            }
        }
    }
    if (!isMultiple) {
        el.selectedIndex = -1;
    }
}

function hasNoMatchingOption (value, options) {
    return options.every(function (o) { return !looseEqual(o, value); })
}

function getValue (option) {
    return '_value' in option
        ? option._value
        : option.value
}

function onCompositionStart (e) {
    e.target.composing = true;
}

function onCompositionEnd (e) {
    // prevent triggering an input event for no reason
    if (!e.target.composing) { return }
    e.target.composing = false;
    trigger(e.target, 'input');
}

function trigger (el, type) {
    var e = document.createEvent('HTMLEvents');
    e.initEvent(type, true, true);
    el.dispatchEvent(e);
}

/*  */

// recursively search for possible transition defined inside the component root
function locateNode (vnode) {
    return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
        ? locateNode(vnode.componentInstance._vnode)
        : vnode
}

var show = {
    bind: function bind (el, ref, vnode) {
        var value = ref.value;

        vnode = locateNode(vnode);
        var transition$$1 = vnode.data && vnode.data.transition;
        var originalDisplay = el.__vOriginalDisplay =
            el.style.display === 'none' ? '' : el.style.display;
        if (value && transition$$1) {
            vnode.data.show = true;
            enter(vnode, function () {
                el.style.display = originalDisplay;
            });
        } else {
            el.style.display = value ? originalDisplay : 'none';
        }
    },

    update: function update (el, ref, vnode) {
        var value = ref.value;
        var oldValue = ref.oldValue;

        /* istanbul ignore if */
        if (!value === !oldValue) { return }
        vnode = locateNode(vnode);
        var transition$$1 = vnode.data && vnode.data.transition;
        if (transition$$1) {
            vnode.data.show = true;
            if (value) {
                enter(vnode, function () {
                    el.style.display = el.__vOriginalDisplay;
                });
            } else {
                leave(vnode, function () {
                    el.style.display = 'none';
                });
            }
        } else {
            el.style.display = value ? el.__vOriginalDisplay : 'none';
        }
    },

    unbind: function unbind (
        el,
        binding,
        vnode,
        oldVnode,
        isDestroy
    ) {
        if (!isDestroy) {
            el.style.display = el.__vOriginalDisplay;
        }
    }
};

var platformDirectives = {
    model: directive,
    show: show
};

/*  */

var transitionProps = {
    name: String,
    appear: Boolean,
    css: Boolean,
    mode: String,
    type: String,
    enterClass: String,
    leaveClass: String,
    enterToClass: String,
    leaveToClass: String,
    enterActiveClass: String,
    leaveActiveClass: String,
    appearClass: String,
    appearActiveClass: String,
    appearToClass: String,
    duration: [Number, String, Object]
};

// in case the child is also an abstract component, e.g. <keep-alive>
// we want to recursively retrieve the real component to be rendered
function getRealChild (vnode) {
    var compOptions = vnode && vnode.componentOptions;
    if (compOptions && compOptions.Ctor.options.abstract) {
        return getRealChild(getFirstComponentChild(compOptions.children))
    } else {
        return vnode
    }
}

function extractTransitionData (comp) {
    var data = {};
    var options = comp.$options;
    // props
    for (var key in options.propsData) {
        data[key] = comp[key];
    }
    // events.
    // extract listeners and pass them directly to the transition methods
    var listeners = options._parentListeners;
    for (var key$1 in listeners) {
        data[camelize(key$1)] = listeners[key$1];
    }
    return data
}

function placeholder (h, rawChild) {
    if (/\d-keep-alive$/.test(rawChild.tag)) {
        return h('keep-alive', {
            props: rawChild.componentOptions.propsData
        })
    }
}

function hasParentTransition (vnode) {
    while ((vnode = vnode.parent)) {
        if (vnode.data.transition) {
            return true
        }
    }
}

function isSameChild (child, oldChild) {
    return oldChild.key === child.key && oldChild.tag === child.tag
}

var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };

var isVShowDirective = function (d) { return d.name === 'show'; };

var Transition = {
    name: 'transition',
    props: transitionProps,
    abstract: true,

    render: function render (h) {
        var this$1 = this;

        var children = this.$slots.default;
        if (!children) {
            return
        }

        // filter out text nodes (possible whitespaces)
        children = children.filter(isNotTextNode);
        /* istanbul ignore if */
        if (!children.length) {
            return
        }

        // warn multiple elements
        if (children.length > 1) {
            warn(
                '<transition> can only be used on a single element. Use ' +
                '<transition-group> for lists.',
                this.$parent
            );
        }

        var mode = this.mode;

        // warn invalid mode
        if (mode && mode !== 'in-out' && mode !== 'out-in'
        ) {
            warn(
                'invalid <transition> mode: ' + mode,
                this.$parent
            );
        }

        var rawChild = children[0];

        // if this is a component root node and the component's
        // parent container node also has transition, skip.
        if (hasParentTransition(this.$vnode)) {
            return rawChild
        }

        // apply transition data to child
        // use getRealChild() to ignore abstract components e.g. keep-alive
        var child = getRealChild(rawChild);
        /* istanbul ignore if */
        if (!child) {
            return rawChild
        }

        if (this._leaving) {
            return placeholder(h, rawChild)
        }

        // ensure a key that is unique to the vnode type and to this transition
        // component instance. This key will be used to remove pending leaving nodes
        // during entering.
        var id = "__transition-" + (this._uid) + "-";
        child.key = child.key == null
            ? child.isComment
                ? id + 'comment'
                : id + child.tag
            : isPrimitive(child.key)
                ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
                : child.key;

        var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
        var oldRawChild = this._vnode;
        var oldChild = getRealChild(oldRawChild);

        // mark v-show
        // so that the transition module can hand over the control to the directive
        if (child.data.directives && child.data.directives.some(isVShowDirective)) {
            child.data.show = true;
        }

        if (
            oldChild &&
            oldChild.data &&
            !isSameChild(child, oldChild) &&
            !isAsyncPlaceholder(oldChild) &&
            // #6687 component root is a comment node
            !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
        ) {
            // replace old child transition data with fresh one
            // important for dynamic transitions!
            var oldData = oldChild.data.transition = extend({}, data);
            // handle transition mode
            if (mode === 'out-in') {
                // return placeholder node and queue update when leave finishes
                this._leaving = true;
                mergeVNodeHook(oldData, 'afterLeave', function () {
                    this$1._leaving = false;
                    this$1.$forceUpdate();
                });
                return placeholder(h, rawChild)
            } else if (mode === 'in-out') {
                if (isAsyncPlaceholder(child)) {
                    return oldRawChild
                }
                var delayedLeave;
                var performLeave = function () { delayedLeave(); };
                mergeVNodeHook(data, 'afterEnter', performLeave);
                mergeVNodeHook(data, 'enterCancelled', performLeave);
                mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
            }
        }

        return rawChild
    }
};

/*  */

var props = extend({
    tag: String,
    moveClass: String
}, transitionProps);

delete props.mode;

var TransitionGroup = {
    props: props,

    beforeMount: function beforeMount () {
        var this$1 = this;

        var update = this._update;
        this._update = function (vnode, hydrating) {
            var restoreActiveInstance = setActiveInstance(this$1);
            // force removing pass
            this$1.__patch__(
                this$1._vnode,
                this$1.kept,
                false, // hydrating
                true // removeOnly (!important, avoids unnecessary moves)
            );
            this$1._vnode = this$1.kept;
            restoreActiveInstance();
            update.call(this$1, vnode, hydrating);
        };
    },

    render: function render (h) {
        var tag = this.tag || this.$vnode.data.tag || 'span';
        var map = Object.create(null);
        var prevChildren = this.prevChildren = this.children;
        var rawChildren = this.$slots.default || [];
        var children = this.children = [];
        var transitionData = extractTransitionData(this);

        for (var i = 0; i < rawChildren.length; i++) {
            var c = rawChildren[i];
            if (c.tag) {
                if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                    children.push(c);
                    map[c.key] = c
                    ;(c.data || (c.data = {})).transition = transitionData;
                } else {
                    var opts = c.componentOptions;
                    var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                    warn(("<transition-group> children must be keyed: <" + name + ">"));
                }
            }
        }

        if (prevChildren) {
            var kept = [];
            var removed = [];
            for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                var c$1 = prevChildren[i$1];
                c$1.data.transition = transitionData;
                c$1.data.pos = c$1.elm.getBoundingClientRect();
                if (map[c$1.key]) {
                    kept.push(c$1);
                } else {
                    removed.push(c$1);
                }
            }
            this.kept = h(tag, null, kept);
            this.removed = removed;
        }

        return h(tag, null, children)
    },

    updated: function updated () {
        var children = this.prevChildren;
        var moveClass = this.moveClass || ((this.name || 'v') + '-move');
        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
            return
        }

        // we divide the work into three loops to avoid mixing DOM reads and writes
        // in each iteration - which helps prevent layout thrashing.
        children.forEach(callPendingCbs);
        children.forEach(recordPosition);
        children.forEach(applyTranslation);

        // force reflow to put everything in position
        // assign to this to avoid being removed in tree-shaking
        // $flow-disable-line
        this._reflow = document.body.offsetHeight;

        children.forEach(function (c) {
            if (c.data.moved) {
                var el = c.elm;
                var s = el.style;
                addTransitionClass(el, moveClass);
                s.transform = s.WebkitTransform = s.transitionDuration = '';
                el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
                    if (e && e.target !== el) {
                        return
                    }
                    if (!e || /transform$/.test(e.propertyName)) {
                        el.removeEventListener(transitionEndEvent, cb);
                        el._moveCb = null;
                        removeTransitionClass(el, moveClass);
                    }
                });
            }
        });
    },

    methods: {
        hasMove: function hasMove (el, moveClass) {
            /* istanbul ignore if */
            if (!hasTransition) {
                return false
            }
            /* istanbul ignore if */
            if (this._hasMove) {
                return this._hasMove
            }
            // Detect whether an element with the move class applied has
            // CSS transitions. Since the element may be inside an entering
            // transition at this very moment, we make a clone of it and remove
            // all other transition classes applied to ensure only the move class
            // is applied.
            var clone = el.cloneNode();
            if (el._transitionClasses) {
                el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
            }
            addClass(clone, moveClass);
            clone.style.display = 'none';
            this.$el.appendChild(clone);
            var info = getTransitionInfo(clone);
            this.$el.removeChild(clone);
            return (this._hasMove = info.hasTransform)
        }
    }
};

function callPendingCbs (c) {
    /* istanbul ignore if */
    if (c.elm._moveCb) {
        c.elm._moveCb();
    }
    /* istanbul ignore if */
    if (c.elm._enterCb) {
        c.elm._enterCb();
    }
}

function recordPosition (c) {
    c.data.newPos = c.elm.getBoundingClientRect();
}

function applyTranslation (c) {
    var oldPos = c.data.pos;
    var newPos = c.data.newPos;
    var dx = oldPos.left - newPos.left;
    var dy = oldPos.top - newPos.top;
    if (dx || dy) {
        c.data.moved = true;
        var s = c.elm.style;
        s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
        s.transitionDuration = '0s';
    }
}

var platformComponents = {
    Transition: Transition,
    TransitionGroup: TransitionGroup
};

/*  */

// install platform specific utils
Vue.config.mustUseProp = mustUseProp;
Vue.config.isReservedTag = isReservedTag;
Vue.config.isReservedAttr = isReservedAttr;
Vue.config.getTagNamespace = getTagNamespace;
Vue.config.isUnknownElement = isUnknownElement;

// install platform runtime directives & components
extend(Vue.options.directives, platformDirectives);
extend(Vue.options.components, platformComponents);

// install platform patch function
Vue.prototype.__patch__ = inBrowser ? patch : noop;

// public mount method
Vue.prototype.$mount = function (
    el,
    hydrating
) {
    el = el && inBrowser ? query(el) : undefined;
    return mountComponent(this, el, hydrating)
};

// devtools global hook
/* istanbul ignore next */
if (inBrowser) {
    setTimeout(function () {
        if (config.devtools) {
            if (devtools) {
                devtools.emit('init', Vue);
            } else {
                console[console.info ? 'info' : 'log'](
                    'Download the Vue Devtools extension for a better development experience:\n' +
                    'https://github.com/vuejs/vue-devtools'
                );
            }
        }
        if (config.productionTip !== false &&
            typeof console !== 'undefined'
        ) {
            console[console.info ? 'info' : 'log'](
                "You are running Vue in development mode.\n" +
                "Make sure to turn on production mode when deploying for production.\n" +
                "See more tips at https://vuejs.org/guide/deployment.html"
            );
        }
    }, 0);
}

/*  */

var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

var buildRegex = cached(function (delimiters) {
    var open = delimiters[0].replace(regexEscapeRE, '\\$&');
    var close = delimiters[1].replace(regexEscapeRE, '\\$&');
    return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
});



function parseText (
    text,
    delimiters
) {
    var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
    if (!tagRE.test(text)) {
        return
    }
    var tokens = [];
    var rawTokens = [];
    var lastIndex = tagRE.lastIndex = 0;
    var match, index, tokenValue;
    while ((match = tagRE.exec(text))) {
        index = match.index;
        // push text token
        if (index > lastIndex) {
            rawTokens.push(tokenValue = text.slice(lastIndex, index));
            tokens.push(JSON.stringify(tokenValue));
        }
        // tag token
        var exp = parseFilters(match[1].trim());
        tokens.push(("_s(" + exp + ")"));
        rawTokens.push({ '@binding': exp });
        lastIndex = index + match[0].length;
    }
    if (lastIndex < text.length) {
        rawTokens.push(tokenValue = text.slice(lastIndex));
        tokens.push(JSON.stringify(tokenValue));
    }
    return {
        expression: tokens.join('+'),
        tokens: rawTokens
    }
}

/*  */

function transformNode (el, options) {
    var warn = options.warn || baseWarn;
    var staticClass = getAndRemoveAttr(el, 'class');
    if (staticClass) {
        var res = parseText(staticClass, options.delimiters);
        if (res) {
            warn(
                "class=\"" + staticClass + "\": " +
                'Interpolation inside attributes has been removed. ' +
                'Use v-bind or the colon shorthand instead. For example, ' +
                'instead of <div class="{{ val }}">, use <div :class="val">.',
                el.rawAttrsMap['class']
            );
        }
    }
    if (staticClass) {
        el.staticClass = JSON.stringify(staticClass);
    }
    var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
    if (classBinding) {
        el.classBinding = classBinding;
    }
}

function genData (el) {
    var data = '';
    if (el.staticClass) {
        data += "staticClass:" + (el.staticClass) + ",";
    }
    if (el.classBinding) {
        data += "class:" + (el.classBinding) + ",";
    }
    return data
}

var klass$1 = {
    staticKeys: ['staticClass'],
    transformNode: transformNode,
    genData: genData
};

/*  */

function transformNode$1 (el, options) {
    var warn = options.warn || baseWarn;
    var staticStyle = getAndRemoveAttr(el, 'style');
    if (staticStyle) {
        /* istanbul ignore if */
        {
            var res = parseText(staticStyle, options.delimiters);
            if (res) {
                warn(
                    "style=\"" + staticStyle + "\": " +
                    'Interpolation inside attributes has been removed. ' +
                    'Use v-bind or the colon shorthand instead. For example, ' +
                    'instead of <div style="{{ val }}">, use <div :style="val">.',
                    el.rawAttrsMap['style']
                );
            }
        }
        el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
    }

    var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
    if (styleBinding) {
        el.styleBinding = styleBinding;
    }
}

function genData$1 (el) {
    var data = '';
    if (el.staticStyle) {
        data += "staticStyle:" + (el.staticStyle) + ",";
    }
    if (el.styleBinding) {
        data += "style:(" + (el.styleBinding) + "),";
    }
    return data
}

var style$1 = {
    staticKeys: ['staticStyle'],
    transformNode: transformNode$1,
    genData: genData$1
};

/*  */

var decoder;

var he = {
    decode: function decode (html) {
        decoder = decoder || document.createElement('div');
        decoder.innerHTML = html;
        return decoder.textContent
    }
};

/*  */

var isUnaryTag = makeMap(
    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
    'link,meta,param,source,track,wbr'
);

// Elements that you can, intentionally, leave open
// (and which close themselves)
var canBeLeftOpenTag = makeMap(
    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
);

// HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
// Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
var isNonPhrasingTag = makeMap(
    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
    'title,tr,track'
);

/**
 * Not type-checking this file because it's mostly vendor code.
 */

// Regular Expressions for parsing tags and attributes
var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
var startTagOpen = new RegExp(("^<" + qnameCapture));
var startTagClose = /^\s*(\/?)>/;
var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
var doctype = /^<!DOCTYPE [^>]+>/i;
// #7298: escape - to avoid being pased as HTML comment when inlined in page
var comment = /^<!\--/;
var conditionalComment = /^<!\[/;

// Special Elements (can contain anything)
var isPlainTextElement = makeMap('script,style,textarea', true);
var reCache = {};

var decodingMap = {
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&amp;': '&',
    '&#10;': '\n',
    '&#9;': '\t',
    '&#39;': "'"
};
var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;

// #5992
var isIgnoreNewlineTag = makeMap('pre,textarea', true);
var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };

function decodeAttr (value, shouldDecodeNewlines) {
    var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
    return value.replace(re, function (match) { return decodingMap[match]; })
}

function parseHTML (html, options) {
    var stack = [];
    var expectHTML = options.expectHTML;
    var isUnaryTag$$1 = options.isUnaryTag || no;
    var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
    var index = 0;
    var last, lastTag;
    while (html) {
        last = html;
        // Make sure we're not in a plaintext content element like script/style
        if (!lastTag || !isPlainTextElement(lastTag)) {
            var textEnd = html.indexOf('<');
            if (textEnd === 0) {
                // Comment:
                if (comment.test(html)) {
                    var commentEnd = html.indexOf('-->');

                    if (commentEnd >= 0) {
                        if (options.shouldKeepComment) {
                            options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
                        }
                        advance(commentEnd + 3);
                        continue
                    }
                }

                // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                if (conditionalComment.test(html)) {
                    var conditionalEnd = html.indexOf(']>');

                    if (conditionalEnd >= 0) {
                        advance(conditionalEnd + 2);
                        continue
                    }
                }

                // Doctype:
                var doctypeMatch = html.match(doctype);
                if (doctypeMatch) {
                    advance(doctypeMatch[0].length);
                    continue
                }

                // End tag:
                var endTagMatch = html.match(endTag);
                if (endTagMatch) {
                    var curIndex = index;
                    advance(endTagMatch[0].length);
                    parseEndTag(endTagMatch[1], curIndex, index);
                    continue
                }

                // Start tag:
                var startTagMatch = parseStartTag();
                if (startTagMatch) {
                    handleStartTag(startTagMatch);
                    if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
                        advance(1);
                    }
                    continue
                }
            }

            var text = (void 0), rest = (void 0), next = (void 0);
            if (textEnd >= 0) {
                rest = html.slice(textEnd);
                while (
                    !endTag.test(rest) &&
                    !startTagOpen.test(rest) &&
                    !comment.test(rest) &&
                    !conditionalComment.test(rest)
                    ) {
                    // < in plain text, be forgiving and treat it as text
                    next = rest.indexOf('<', 1);
                    if (next < 0) { break }
                    textEnd += next;
                    rest = html.slice(textEnd);
                }
                text = html.substring(0, textEnd);
            }

            if (textEnd < 0) {
                text = html;
            }

            if (text) {
                advance(text.length);
            }

            if (options.chars && text) {
                options.chars(text, index - text.length, index);
            }
        } else {
            var endTagLength = 0;
            var stackedTag = lastTag.toLowerCase();
            var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
            var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
                endTagLength = endTag.length;
                if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                    text = text
                        .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
                        .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                }
                if (shouldIgnoreFirstNewline(stackedTag, text)) {
                    text = text.slice(1);
                }
                if (options.chars) {
                    options.chars(text);
                }
                return ''
            });
            index += html.length - rest$1.length;
            html = rest$1;
            parseEndTag(stackedTag, index - endTagLength, index);
        }

        if (html === last) {
            options.chars && options.chars(html);
            if (!stack.length && options.warn) {
                options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
            }
            break
        }
    }

    // Clean up any remaining tags
    parseEndTag();

    function advance (n) {
        index += n;
        html = html.substring(n);
    }

    function parseStartTag () {
        var start = html.match(startTagOpen);
        if (start) {
            var match = {
                tagName: start[1],
                attrs: [],
                start: index
            };
            advance(start[0].length);
            var end, attr;
            while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
                attr.start = index;
                advance(attr[0].length);
                attr.end = index;
                match.attrs.push(attr);
            }
            if (end) {
                match.unarySlash = end[1];
                advance(end[0].length);
                match.end = index;
                return match
            }
        }
    }

    function handleStartTag (match) {
        var tagName = match.tagName;
        var unarySlash = match.unarySlash;

        if (expectHTML) {
            if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                parseEndTag(lastTag);
            }
            if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                parseEndTag(tagName);
            }
        }

        var unary = isUnaryTag$$1(tagName) || !!unarySlash;

        var l = match.attrs.length;
        var attrs = new Array(l);
        for (var i = 0; i < l; i++) {
            var args = match.attrs[i];
            var value = args[3] || args[4] || args[5] || '';
            var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
                ? options.shouldDecodeNewlinesForHref
                : options.shouldDecodeNewlines;
            attrs[i] = {
                name: args[1],
                value: decodeAttr(value, shouldDecodeNewlines)
            };
            if (options.outputSourceRange) {
                attrs[i].start = args.start + args[0].match(/^\s*/).length;
                attrs[i].end = args.end;
            }
        }

        if (!unary) {
            stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs, start: match.start, end: match.end });
            lastTag = tagName;
        }

        if (options.start) {
            options.start(tagName, attrs, unary, match.start, match.end);
        }
    }

    function parseEndTag (tagName, start, end) {
        var pos, lowerCasedTagName;
        if (start == null) { start = index; }
        if (end == null) { end = index; }

        // Find the closest opened tag of the same type
        if (tagName) {
            lowerCasedTagName = tagName.toLowerCase();
            for (pos = stack.length - 1; pos >= 0; pos--) {
                if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                    break
                }
            }
        } else {
            // If no tag name is provided, clean shop
            pos = 0;
        }

        if (pos >= 0) {
            // Close all the open elements, up the stack
            for (var i = stack.length - 1; i >= pos; i--) {
                if (i > pos || !tagName &&
                    options.warn
                ) {
                    options.warn(
                        ("tag <" + (stack[i].tag) + "> has no matching end tag."),
                        { start: stack[i].start, end: stack[i].end }
                    );
                }
                if (options.end) {
                    options.end(stack[i].tag, start, end);
                }
            }

            // Remove the open elements from the stack
            stack.length = pos;
            lastTag = pos && stack[pos - 1].tag;
        } else if (lowerCasedTagName === 'br') {
            if (options.start) {
                options.start(tagName, [], true, start, end);
            }
        } else if (lowerCasedTagName === 'p') {
            if (options.start) {
                options.start(tagName, [], false, start, end);
            }
            if (options.end) {
                options.end(tagName, start, end);
            }
        }
    }
}

/*  */

var onRE = /^@|^v-on:/;
var dirRE = /^v-|^@|^:/;
var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
var stripParensRE = /^\(|\)$/g;
var dynamicArgRE = /^\[.*\]$/;

var argRE = /:(.*)$/;
var bindRE = /^:|^\.|^v-bind:/;
var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;

var slotRE = /^v-slot(:|$)|^#/;

var lineBreakRE = /[\r\n]/;
var whitespaceRE$1 = /\s+/g;

var invalidAttributeRE = /[\s"'<>\/=]/;

var decodeHTMLCached = cached(he.decode);

var emptySlotScopeToken = "_empty_";

// configurable state
var warn$2;
var delimiters;
var transforms;
var preTransforms;
var postTransforms;
var platformIsPreTag;
var platformMustUseProp;
var platformGetTagNamespace;
var maybeComponent;

function createASTElement (
    tag,
    attrs,
    parent
) {
    return {
        type: 1,
        tag: tag,
        attrsList: attrs,
        attrsMap: makeAttrsMap(attrs),
        rawAttrsMap: {},
        parent: parent,
        children: []
    }
}

/**
 * Convert HTML string to AST.
 */
function parse (
    template,
    options
) {
    warn$2 = options.warn || baseWarn;

    platformIsPreTag = options.isPreTag || no;
    platformMustUseProp = options.mustUseProp || no;
    platformGetTagNamespace = options.getTagNamespace || no;
    var isReservedTag = options.isReservedTag || no;
    maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };

    transforms = pluckModuleFunction(options.modules, 'transformNode');
    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');

    delimiters = options.delimiters;

    var stack = [];
    var preserveWhitespace = options.preserveWhitespace !== false;
    var whitespaceOption = options.whitespace;
    var root;
    var currentParent;
    var inVPre = false;
    var inPre = false;
    var warned = false;

    function warnOnce (msg, range) {
        if (!warned) {
            warned = true;
            warn$2(msg, range);
        }
    }

    function closeElement (element) {
        trimEndingWhitespace(element);
        if (!inVPre && !element.processed) {
            element = processElement(element, options);
        }
        // tree management
        if (!stack.length && element !== root) {
            // allow root elements with v-if, v-else-if and v-else
            if (root.if && (element.elseif || element.else)) {
                {
                    checkRootConstraints(element);
                }
                addIfCondition(root, {
                    exp: element.elseif,
                    block: element
                });
            } else {
                warnOnce(
                    "Component template should contain exactly one root element. " +
                    "If you are using v-if on multiple elements, " +
                    "use v-else-if to chain them instead.",
                    { start: element.start }
                );
            }
        }
        if (currentParent && !element.forbidden) {
            if (element.elseif || element.else) {
                processIfConditions(element, currentParent);
            } else {
                if (element.slotScope) {
                    // scoped slot
                    // keep it in the children list so that v-else(-if) conditions can
                    // find it as the prev node.
                    var name = element.slotTarget || '"default"'
                    ;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                }
                currentParent.children.push(element);
                element.parent = currentParent;
            }
        }

        // final children cleanup
        // filter out scoped slots
        element.children = element.children.filter(function (c) { return !(c).slotScope; });
        // remove trailing whitespace node again
        trimEndingWhitespace(element);

        // check pre state
        if (element.pre) {
            inVPre = false;
        }
        if (platformIsPreTag(element.tag)) {
            inPre = false;
        }
        // apply post-transforms
        for (var i = 0; i < postTransforms.length; i++) {
            postTransforms[i](element, options);
        }
    }

    function trimEndingWhitespace (el) {
        // remove trailing whitespace node
        if (!inPre) {
            var lastNode;
            while (
                (lastNode = el.children[el.children.length - 1]) &&
                lastNode.type === 3 &&
                lastNode.text === ' '
                ) {
                el.children.pop();
            }
        }
    }

    function checkRootConstraints (el) {
        if (el.tag === 'slot' || el.tag === 'template') {
            warnOnce(
                "Cannot use <" + (el.tag) + "> as component root element because it may " +
                'contain multiple nodes.',
                { start: el.start }
            );
        }
        if (el.attrsMap.hasOwnProperty('v-for')) {
            warnOnce(
                'Cannot use v-for on stateful component root element because ' +
                'it renders multiple elements.',
                el.rawAttrsMap['v-for']
            );
        }
    }

    parseHTML(template, {
        warn: warn$2,
        expectHTML: options.expectHTML,
        isUnaryTag: options.isUnaryTag,
        canBeLeftOpenTag: options.canBeLeftOpenTag,
        shouldDecodeNewlines: options.shouldDecodeNewlines,
        shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
        shouldKeepComment: options.comments,
        outputSourceRange: options.outputSourceRange,
        start: function start (tag, attrs, unary, start$1, end) {
            // check namespace.
            // inherit parent ns if there is one
            var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

            // handle IE svg bug
            /* istanbul ignore if */
            if (isIE && ns === 'svg') {
                attrs = guardIESVGBug(attrs);
            }

            var element = createASTElement(tag, attrs, currentParent);
            if (ns) {
                element.ns = ns;
            }

            {
                if (options.outputSourceRange) {
                    element.start = start$1;
                    element.end = end;
                    element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
                        cumulated[attr.name] = attr;
                        return cumulated
                    }, {});
                }
                attrs.forEach(function (attr) {
                    if (invalidAttributeRE.test(attr.name)) {
                        warn$2(
                            "Invalid dynamic argument expression: attribute names cannot contain " +
                            "spaces, quotes, <, >, / or =.",
                            {
                                start: attr.start + attr.name.indexOf("["),
                                end: attr.start + attr.name.length
                            }
                        );
                    }
                });
            }

            if (isForbiddenTag(element) && !isServerRendering()) {
                element.forbidden = true;
                warn$2(
                    'Templates should only be responsible for mapping the state to the ' +
                    'UI. Avoid placing tags with side-effects in your templates, such as ' +
                    "<" + tag + ">" + ', as they will not be parsed.',
                    { start: element.start }
                );
            }

            // apply pre-transforms
            for (var i = 0; i < preTransforms.length; i++) {
                element = preTransforms[i](element, options) || element;
            }

            if (!inVPre) {
                processPre(element);
                if (element.pre) {
                    inVPre = true;
                }
            }
            if (platformIsPreTag(element.tag)) {
                inPre = true;
            }
            if (inVPre) {
                processRawAttrs(element);
            } else if (!element.processed) {
                // structural directives
                processFor(element);
                processIf(element);
                processOnce(element);
            }

            if (!root) {
                root = element;
                {
                    checkRootConstraints(root);
                }
            }

            if (!unary) {
                currentParent = element;
                stack.push(element);
            } else {
                closeElement(element);
            }
        },

        end: function end (tag, start, end$1) {
            var element = stack[stack.length - 1];
            // pop stack
            stack.length -= 1;
            currentParent = stack[stack.length - 1];
            if (options.outputSourceRange) {
                element.end = end$1;
            }
            closeElement(element);
        },

        chars: function chars (text, start, end) {
            if (!currentParent) {
                {
                    if (text === template) {
                        warnOnce(
                            'Component template requires a root element, rather than just text.',
                            { start: start }
                        );
                    } else if ((text = text.trim())) {
                        warnOnce(
                            ("text \"" + text + "\" outside root element will be ignored."),
                            { start: start }
                        );
                    }
                }
                return
            }
            // IE textarea placeholder bug
            /* istanbul ignore if */
            if (isIE &&
                currentParent.tag === 'textarea' &&
                currentParent.attrsMap.placeholder === text
            ) {
                return
            }
            var children = currentParent.children;
            if (inPre || text.trim()) {
                text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
            } else if (!children.length) {
                // remove the whitespace-only node right after an opening tag
                text = '';
            } else if (whitespaceOption) {
                if (whitespaceOption === 'condense') {
                    // in condense mode, remove the whitespace node if it contains
                    // line break, otherwise condense to a single space
                    text = lineBreakRE.test(text) ? '' : ' ';
                } else {
                    text = ' ';
                }
            } else {
                text = preserveWhitespace ? ' ' : '';
            }
            if (text) {
                if (!inPre && whitespaceOption === 'condense') {
                    // condense consecutive whitespaces into single space
                    text = text.replace(whitespaceRE$1, ' ');
                }
                var res;
                var child;
                if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
                    child = {
                        type: 2,
                        expression: res.expression,
                        tokens: res.tokens,
                        text: text
                    };
                } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                    child = {
                        type: 3,
                        text: text
                    };
                }
                if (child) {
                    if (options.outputSourceRange) {
                        child.start = start;
                        child.end = end;
                    }
                    children.push(child);
                }
            }
        },
        comment: function comment (text, start, end) {
            // adding anyting as a sibling to the root node is forbidden
            // comments should still be allowed, but ignored
            if (currentParent) {
                var child = {
                    type: 3,
                    text: text,
                    isComment: true
                };
                if (options.outputSourceRange) {
                    child.start = start;
                    child.end = end;
                }
                currentParent.children.push(child);
            }
        }
    });
    return root
}

function processPre (el) {
    if (getAndRemoveAttr(el, 'v-pre') != null) {
        el.pre = true;
    }
}

function processRawAttrs (el) {
    var list = el.attrsList;
    var len = list.length;
    if (len) {
        var attrs = el.attrs = new Array(len);
        for (var i = 0; i < len; i++) {
            attrs[i] = {
                name: list[i].name,
                value: JSON.stringify(list[i].value)
            };
            if (list[i].start != null) {
                attrs[i].start = list[i].start;
                attrs[i].end = list[i].end;
            }
        }
    } else if (!el.pre) {
        // non root node in pre blocks with no attributes
        el.plain = true;
    }
}

function processElement (
    element,
    options
) {
    processKey(element);

    // determine whether this is a plain element after
    // removing structural attributes
    element.plain = (
        !element.key &&
        !element.scopedSlots &&
        !element.attrsList.length
    );

    processRef(element);
    processSlotContent(element);
    processSlotOutlet(element);
    processComponent(element);
    for (var i = 0; i < transforms.length; i++) {
        element = transforms[i](element, options) || element;
    }
    processAttrs(element);
    return element
}

function processKey (el) {
    var exp = getBindingAttr(el, 'key');
    if (exp) {
        {
            if (el.tag === 'template') {
                warn$2(
                    "<template> cannot be keyed. Place the key on real elements instead.",
                    getRawBindingAttr(el, 'key')
                );
            }
            if (el.for) {
                var iterator = el.iterator2 || el.iterator1;
                var parent = el.parent;
                if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
                    warn$2(
                        "Do not use v-for index as key on <transition-group> children, " +
                        "this is the same as not using keys.",
                        getRawBindingAttr(el, 'key'),
                        true /* tip */
                    );
                }
            }
        }
        el.key = exp;
    }
}

function processRef (el) {
    var ref = getBindingAttr(el, 'ref');
    if (ref) {
        el.ref = ref;
        el.refInFor = checkInFor(el);
    }
}

function processFor (el) {
    var exp;
    if ((exp = getAndRemoveAttr(el, 'v-for'))) {
        var res = parseFor(exp);
        if (res) {
            extend(el, res);
        } else {
            warn$2(
                ("Invalid v-for expression: " + exp),
                el.rawAttrsMap['v-for']
            );
        }
    }
}



function parseFor (exp) {
    var inMatch = exp.match(forAliasRE);
    if (!inMatch) { return }
    var res = {};
    res.for = inMatch[2].trim();
    var alias = inMatch[1].trim().replace(stripParensRE, '');
    var iteratorMatch = alias.match(forIteratorRE);
    if (iteratorMatch) {
        res.alias = alias.replace(forIteratorRE, '').trim();
        res.iterator1 = iteratorMatch[1].trim();
        if (iteratorMatch[2]) {
            res.iterator2 = iteratorMatch[2].trim();
        }
    } else {
        res.alias = alias;
    }
    return res
}

function processIf (el) {
    var exp = getAndRemoveAttr(el, 'v-if');
    if (exp) {
        el.if = exp;
        addIfCondition(el, {
            exp: exp,
            block: el
        });
    } else {
        if (getAndRemoveAttr(el, 'v-else') != null) {
            el.else = true;
        }
        var elseif = getAndRemoveAttr(el, 'v-else-if');
        if (elseif) {
            el.elseif = elseif;
        }
    }
}

function processIfConditions (el, parent) {
    var prev = findPrevElement(parent.children);
    if (prev && prev.if) {
        addIfCondition(prev, {
            exp: el.elseif,
            block: el
        });
    } else {
        warn$2(
            "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
            "used on element <" + (el.tag) + "> without corresponding v-if.",
            el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']
        );
    }
}

function findPrevElement (children) {
    var i = children.length;
    while (i--) {
        if (children[i].type === 1) {
            return children[i]
        } else {
            if (children[i].text !== ' ') {
                warn$2(
                    "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                    "will be ignored.",
                    children[i]
                );
            }
            children.pop();
        }
    }
}

function addIfCondition (el, condition) {
    if (!el.ifConditions) {
        el.ifConditions = [];
    }
    el.ifConditions.push(condition);
}

function processOnce (el) {
    var once$$1 = getAndRemoveAttr(el, 'v-once');
    if (once$$1 != null) {
        el.once = true;
    }
}

// handle content being passed to a component as slot,
// e.g. <template slot="xxx">, <div slot-scope="xxx">
function processSlotContent (el) {
    var slotScope;
    if (el.tag === 'template') {
        slotScope = getAndRemoveAttr(el, 'scope');
        /* istanbul ignore if */
        if (slotScope) {
            warn$2(
                "the \"scope\" attribute for scoped slots have been deprecated and " +
                "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
                "can also be used on plain elements in addition to <template> to " +
                "denote scoped slots.",
                el.rawAttrsMap['scope'],
                true
            );
        }
        el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
    } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
        /* istanbul ignore if */
        if (el.attrsMap['v-for']) {
            warn$2(
                "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
                "(v-for takes higher priority). Use a wrapper <template> for the " +
                "scoped slot to make it clearer.",
                el.rawAttrsMap['slot-scope'],
                true
            );
        }
        el.slotScope = slotScope;
    }

    // slot="xxx"
    var slotTarget = getBindingAttr(el, 'slot');
    if (slotTarget) {
        el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
        el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
        // preserve slot as an attribute for native shadow DOM compat
        // only for non-scoped slots.
        if (el.tag !== 'template' && !el.slotScope) {
            addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
        }
    }

    // 2.6 v-slot syntax
    {
        if (el.tag === 'template') {
            // v-slot on <template>
            var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
            if (slotBinding) {
                {
                    if (el.slotTarget || el.slotScope) {
                        warn$2(
                            "Unexpected mixed usage of different slot syntaxes.",
                            el
                        );
                    }
                    if (el.parent && !maybeComponent(el.parent)) {
                        warn$2(
                            "<template v-slot> can only appear at the root level inside " +
                            "the receiving the component",
                            el
                        );
                    }
                }
                var ref = getSlotName(slotBinding);
                var name = ref.name;
                var dynamic = ref.dynamic;
                el.slotTarget = name;
                el.slotTargetDynamic = dynamic;
                el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
            }
        } else {
            // v-slot on component, denotes default slot
            var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
            if (slotBinding$1) {
                {
                    if (!maybeComponent(el)) {
                        warn$2(
                            "v-slot can only be used on components or <template>.",
                            slotBinding$1
                        );
                    }
                    if (el.slotScope || el.slotTarget) {
                        warn$2(
                            "Unexpected mixed usage of different slot syntaxes.",
                            el
                        );
                    }
                    if (el.scopedSlots) {
                        warn$2(
                            "To avoid scope ambiguity, the default slot should also use " +
                            "<template> syntax when there are other named slots.",
                            slotBinding$1
                        );
                    }
                }
                // add the component's children to its default slot
                var slots = el.scopedSlots || (el.scopedSlots = {});
                var ref$1 = getSlotName(slotBinding$1);
                var name$1 = ref$1.name;
                var dynamic$1 = ref$1.dynamic;
                var slotContainer = slots[name$1] = createASTElement('template', [], el);
                slotContainer.slotTarget = name$1;
                slotContainer.slotTargetDynamic = dynamic$1;
                slotContainer.children = el.children.filter(function (c) {
                    if (!c.slotScope) {
                        c.parent = slotContainer;
                        return true
                    }
                });
                slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
                // remove children as they are returned from scopedSlots now
                el.children = [];
                // mark el non-plain so data gets generated
                el.plain = false;
            }
        }
    }
}

function getSlotName (binding) {
    var name = binding.name.replace(slotRE, '');
    if (!name) {
        if (binding.name[0] !== '#') {
            name = 'default';
        } else {
            warn$2(
                "v-slot shorthand syntax requires a slot name.",
                binding
            );
        }
    }
    return dynamicArgRE.test(name)
        // dynamic [name]
        ? { name: name.slice(1, -1), dynamic: true }
        // static name
        : { name: ("\"" + name + "\""), dynamic: false }
}

// handle <slot/> outlets
function processSlotOutlet (el) {
    if (el.tag === 'slot') {
        el.slotName = getBindingAttr(el, 'name');
        if (el.key) {
            warn$2(
                "`key` does not work on <slot> because slots are abstract outlets " +
                "and can possibly expand into multiple elements. " +
                "Use the key on a wrapping element instead.",
                getRawBindingAttr(el, 'key')
            );
        }
    }
}

function processComponent (el) {
    var binding;
    if ((binding = getBindingAttr(el, 'is'))) {
        el.component = binding;
    }
    if (getAndRemoveAttr(el, 'inline-template') != null) {
        el.inlineTemplate = true;
    }
}

function processAttrs (el) {
    var list = el.attrsList;
    var i, l, name, rawName, value, modifiers, syncGen, isDynamic;
    for (i = 0, l = list.length; i < l; i++) {
        name = rawName = list[i].name;
        value = list[i].value;
        if (dirRE.test(name)) {
            // mark element as dynamic
            el.hasBindings = true;
            // modifiers
            modifiers = parseModifiers(name.replace(dirRE, ''));
            // support .foo shorthand syntax for the .prop modifier
            if (modifiers) {
                name = name.replace(modifierRE, '');
            }
            if (bindRE.test(name)) { // v-bind
                name = name.replace(bindRE, '');
                value = parseFilters(value);
                isDynamic = dynamicArgRE.test(name);
                if (isDynamic) {
                    name = name.slice(1, -1);
                }
                if (
                    value.trim().length === 0
                ) {
                    warn$2(
                        ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
                    );
                }
                if (modifiers) {
                    if (modifiers.prop && !isDynamic) {
                        name = camelize(name);
                        if (name === 'innerHtml') { name = 'innerHTML'; }
                    }
                    if (modifiers.camel && !isDynamic) {
                        name = camelize(name);
                    }
                    if (modifiers.sync) {
                        syncGen = genAssignmentCode(value, "$event");
                        if (!isDynamic) {
                            addHandler(
                                el,
                                ("update:" + (camelize(name))),
                                syncGen,
                                null,
                                false,
                                warn$2,
                                list[i]
                            );
                            if (hyphenate(name) !== camelize(name)) {
                                addHandler(
                                    el,
                                    ("update:" + (hyphenate(name))),
                                    syncGen,
                                    null,
                                    false,
                                    warn$2,
                                    list[i]
                                );
                            }
                        } else {
                            // handler w/ dynamic event name
                            addHandler(
                                el,
                                ("\"update:\"+(" + name + ")"),
                                syncGen,
                                null,
                                false,
                                warn$2,
                                list[i],
                                true // dynamic
                            );
                        }
                    }
                }
                if ((modifiers && modifiers.prop) || (
                    !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
                )) {
                    addProp(el, name, value, list[i], isDynamic);
                } else {
                    addAttr(el, name, value, list[i], isDynamic);
                }
            } else if (onRE.test(name)) { // v-on
                name = name.replace(onRE, '');
                isDynamic = dynamicArgRE.test(name);
                if (isDynamic) {
                    name = name.slice(1, -1);
                }
                addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
            } else { // normal directives
                name = name.replace(dirRE, '');
                // parse arg
                var argMatch = name.match(argRE);
                var arg = argMatch && argMatch[1];
                isDynamic = false;
                if (arg) {
                    name = name.slice(0, -(arg.length + 1));
                    if (dynamicArgRE.test(arg)) {
                        arg = arg.slice(1, -1);
                        isDynamic = true;
                    }
                }
                addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
                if (name === 'model') {
                    checkForAliasModel(el, value);
                }
            }
        } else {
            // literal attribute
            {
                var res = parseText(value, delimiters);
                if (res) {
                    warn$2(
                        name + "=\"" + value + "\": " +
                        'Interpolation inside attributes has been removed. ' +
                        'Use v-bind or the colon shorthand instead. For example, ' +
                        'instead of <div id="{{ val }}">, use <div :id="val">.',
                        list[i]
                    );
                }
            }
            addAttr(el, name, JSON.stringify(value), list[i]);
            // #6887 firefox doesn't update muted state if set via attribute
            // even immediately after element creation
            if (!el.component &&
                name === 'muted' &&
                platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                addProp(el, name, 'true', list[i]);
            }
        }
    }
}

function checkInFor (el) {
    var parent = el;
    while (parent) {
        if (parent.for !== undefined) {
            return true
        }
        parent = parent.parent;
    }
    return false
}

function parseModifiers (name) {
    var match = name.match(modifierRE);
    if (match) {
        var ret = {};
        match.forEach(function (m) { ret[m.slice(1)] = true; });
        return ret
    }
}

function makeAttrsMap (attrs) {
    var map = {};
    for (var i = 0, l = attrs.length; i < l; i++) {
        if (
            map[attrs[i].name] && !isIE && !isEdge
        ) {
            warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
        }
        map[attrs[i].name] = attrs[i].value;
    }
    return map
}

// for script (e.g. type="x/template") or style, do not decode content
function isTextTag (el) {
    return el.tag === 'script' || el.tag === 'style'
}

function isForbiddenTag (el) {
    return (
        el.tag === 'style' ||
        (el.tag === 'script' && (
            !el.attrsMap.type ||
            el.attrsMap.type === 'text/javascript'
        ))
    )
}

var ieNSBug = /^xmlns:NS\d+/;
var ieNSPrefix = /^NS\d+:/;

/* istanbul ignore next */
function guardIESVGBug (attrs) {
    var res = [];
    for (var i = 0; i < attrs.length; i++) {
        var attr = attrs[i];
        if (!ieNSBug.test(attr.name)) {
            attr.name = attr.name.replace(ieNSPrefix, '');
            res.push(attr);
        }
    }
    return res
}

function checkForAliasModel (el, value) {
    var _el = el;
    while (_el) {
        if (_el.for && _el.alias === value) {
            warn$2(
                "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                "You are binding v-model directly to a v-for iteration alias. " +
                "This will not be able to modify the v-for source array because " +
                "writing to the alias is like modifying a function local variable. " +
                "Consider using an array of objects and use v-model on an object property instead.",
                el.rawAttrsMap['v-model']
            );
        }
        _el = _el.parent;
    }
}

/*  */

function preTransformNode (el, options) {
    if (el.tag === 'input') {
        var map = el.attrsMap;
        if (!map['v-model']) {
            return
        }

        var typeBinding;
        if (map[':type'] || map['v-bind:type']) {
            typeBinding = getBindingAttr(el, 'type');
        }
        if (!map.type && !typeBinding && map['v-bind']) {
            typeBinding = "(" + (map['v-bind']) + ").type";
        }

        if (typeBinding) {
            var ifCondition = getAndRemoveAttr(el, 'v-if', true);
            var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
            var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
            var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
            // 1. checkbox
            var branch0 = cloneASTElement(el);
            // process for on the main node
            processFor(branch0);
            addRawAttr(branch0, 'type', 'checkbox');
            processElement(branch0, options);
            branch0.processed = true; // prevent it from double-processed
            branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
            addIfCondition(branch0, {
                exp: branch0.if,
                block: branch0
            });
            // 2. add radio else-if condition
            var branch1 = cloneASTElement(el);
            getAndRemoveAttr(branch1, 'v-for', true);
            addRawAttr(branch1, 'type', 'radio');
            processElement(branch1, options);
            addIfCondition(branch0, {
                exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
                block: branch1
            });
            // 3. other
            var branch2 = cloneASTElement(el);
            getAndRemoveAttr(branch2, 'v-for', true);
            addRawAttr(branch2, ':type', typeBinding);
            processElement(branch2, options);
            addIfCondition(branch0, {
                exp: ifCondition,
                block: branch2
            });

            if (hasElse) {
                branch0.else = true;
            } else if (elseIfCondition) {
                branch0.elseif = elseIfCondition;
            }

            return branch0
        }
    }
}

function cloneASTElement (el) {
    return createASTElement(el.tag, el.attrsList.slice(), el.parent)
}

var model$1 = {
    preTransformNode: preTransformNode
};

var modules$1 = [
    klass$1,
    style$1,
    model$1
];

/*  */

function text (el, dir) {
    if (dir.value) {
        addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
    }
}

/*  */

function html (el, dir) {
    if (dir.value) {
        addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
    }
}

var directives$1 = {
    model: model,
    text: text,
    html: html
};

/*  */

var baseOptions = {
    expectHTML: true,
    modules: modules$1,
    directives: directives$1,
    isPreTag: isPreTag,
    isUnaryTag: isUnaryTag,
    mustUseProp: mustUseProp,
    canBeLeftOpenTag: canBeLeftOpenTag,
    isReservedTag: isReservedTag,
    getTagNamespace: getTagNamespace,
    staticKeys: genStaticKeys(modules$1)
};

/*  */

var isStaticKey;
var isPlatformReservedTag;

var genStaticKeysCached = cached(genStaticKeys$1);

/**
 * Goal of the optimizer: walk the generated template AST tree
 * and detect sub-trees that are purely static, i.e. parts of
 * the DOM that never needs to change.
 *
 * Once we detect these sub-trees, we can:
 *
 * 1. Hoist them into constants, so that we no longer need to
 *    create fresh nodes for them on each re-render;
 * 2. Completely skip them in the patching process.
 */
function optimize (root, options) {
    if (!root) { return }
    isStaticKey = genStaticKeysCached(options.staticKeys || '');
    isPlatformReservedTag = options.isReservedTag || no;
    // first pass: mark all non-static nodes.
    markStatic$1(root);
    // second pass: mark static roots.
    markStaticRoots(root, false);
}

function genStaticKeys$1 (keys) {
    return makeMap(
        'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
        (keys ? ',' + keys : '')
    )
}

function markStatic$1 (node) {
    node.static = isStatic(node);
    if (node.type === 1) {
        // do not make component slot content static. this avoids
        // 1. components not able to mutate slot nodes
        // 2. static slot content fails for hot-reloading
        if (
            !isPlatformReservedTag(node.tag) &&
            node.tag !== 'slot' &&
            node.attrsMap['inline-template'] == null
        ) {
            return
        }
        for (var i = 0, l = node.children.length; i < l; i++) {
            var child = node.children[i];
            markStatic$1(child);
            if (!child.static) {
                node.static = false;
            }
        }
        if (node.ifConditions) {
            for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                var block = node.ifConditions[i$1].block;
                markStatic$1(block);
                if (!block.static) {
                    node.static = false;
                }
            }
        }
    }
}

function markStaticRoots (node, isInFor) {
    if (node.type === 1) {
        if (node.static || node.once) {
            node.staticInFor = isInFor;
        }
        // For a node to qualify as a static root, it should have children that
        // are not just static text. Otherwise the cost of hoisting out will
        // outweigh the benefits and it's better off to just always render it fresh.
        if (node.static && node.children.length && !(
            node.children.length === 1 &&
            node.children[0].type === 3
        )) {
            node.staticRoot = true;
            return
        } else {
            node.staticRoot = false;
        }
        if (node.children) {
            for (var i = 0, l = node.children.length; i < l; i++) {
                markStaticRoots(node.children[i], isInFor || !!node.for);
            }
        }
        if (node.ifConditions) {
            for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                markStaticRoots(node.ifConditions[i$1].block, isInFor);
            }
        }
    }
}

function isStatic (node) {
    if (node.type === 2) { // expression
        return false
    }
    if (node.type === 3) { // text
        return true
    }
    return !!(node.pre || (
        !node.hasBindings && // no dynamic bindings
        !node.if && !node.for && // not v-if or v-for or v-else
        !isBuiltInTag(node.tag) && // not a built-in
        isPlatformReservedTag(node.tag) && // not a component
        !isDirectChildOfTemplateFor(node) &&
        Object.keys(node).every(isStaticKey)
    ))
}

function isDirectChildOfTemplateFor (node) {
    while (node.parent) {
        node = node.parent;
        if (node.tag !== 'template') {
            return false
        }
        if (node.for) {
            return true
        }
    }
    return false
}

/*  */

var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function\s*(?:[\w$]+)?\s*\(/;
var fnInvokeRE = /\([^)]*?\);*$/;
var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;

// KeyboardEvent.keyCode aliases
var keyCodes = {
    esc: 27,
    tab: 9,
    enter: 13,
    space: 32,
    up: 38,
    left: 37,
    right: 39,
    down: 40,
    'delete': [8, 46]
};

// KeyboardEvent.key aliases
var keyNames = {
    // #7880: IE11 and Edge use `Esc` for Escape key name.
    esc: ['Esc', 'Escape'],
    tab: 'Tab',
    enter: 'Enter',
    // #9112: IE11 uses `Spacebar` for Space key name.
    space: [' ', 'Spacebar'],
    // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
    up: ['Up', 'ArrowUp'],
    left: ['Left', 'ArrowLeft'],
    right: ['Right', 'ArrowRight'],
    down: ['Down', 'ArrowDown'],
    // #9112: IE11 uses `Del` for Delete key name.
    'delete': ['Backspace', 'Delete', 'Del']
};

// #4868: modifiers that prevent the execution of the listener
// need to explicitly return null so that we can determine whether to remove
// the listener for .once
var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };

var modifierCode = {
    stop: '$event.stopPropagation();',
    prevent: '$event.preventDefault();',
    self: genGuard("$event.target !== $event.currentTarget"),
    ctrl: genGuard("!$event.ctrlKey"),
    shift: genGuard("!$event.shiftKey"),
    alt: genGuard("!$event.altKey"),
    meta: genGuard("!$event.metaKey"),
    left: genGuard("'button' in $event && $event.button !== 0"),
    middle: genGuard("'button' in $event && $event.button !== 1"),
    right: genGuard("'button' in $event && $event.button !== 2")
};

function genHandlers (
    events,
    isNative
) {
    var prefix = isNative ? 'nativeOn:' : 'on:';
    var staticHandlers = "";
    var dynamicHandlers = "";
    for (var name in events) {
        var handlerCode = genHandler(events[name]);
        if (events[name] && events[name].dynamic) {
            dynamicHandlers += name + "," + handlerCode + ",";
        } else {
            staticHandlers += "\"" + name + "\":" + handlerCode + ",";
        }
    }
    staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
    if (dynamicHandlers) {
        return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
    } else {
        return prefix + staticHandlers
    }
}

function genHandler (handler) {
    if (!handler) {
        return 'function(){}'
    }

    if (Array.isArray(handler)) {
        return ("[" + (handler.map(function (handler) { return genHandler(handler); }).join(',')) + "]")
    }

    var isMethodPath = simplePathRE.test(handler.value);
    var isFunctionExpression = fnExpRE.test(handler.value);
    var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));

    if (!handler.modifiers) {
        if (isMethodPath || isFunctionExpression) {
            return handler.value
        }
        return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
    } else {
        var code = '';
        var genModifierCode = '';
        var keys = [];
        for (var key in handler.modifiers) {
            if (modifierCode[key]) {
                genModifierCode += modifierCode[key];
                // left/right
                if (keyCodes[key]) {
                    keys.push(key);
                }
            } else if (key === 'exact') {
                var modifiers = (handler.modifiers);
                genModifierCode += genGuard(
                    ['ctrl', 'shift', 'alt', 'meta']
                        .filter(function (keyModifier) { return !modifiers[keyModifier]; })
                        .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
                        .join('||')
                );
            } else {
                keys.push(key);
            }
        }
        if (keys.length) {
            code += genKeyFilter(keys);
        }
        // Make sure modifiers like prevent and stop get executed after key filtering
        if (genModifierCode) {
            code += genModifierCode;
        }
        var handlerCode = isMethodPath
            ? ("return " + (handler.value) + "($event)")
            : isFunctionExpression
                ? ("return (" + (handler.value) + ")($event)")
                : isFunctionInvocation
                    ? ("return " + (handler.value))
                    : handler.value;
        return ("function($event){" + code + handlerCode + "}")
    }
}

function genKeyFilter (keys) {
    return (
        // make sure the key filters only apply to KeyboardEvents
        // #9441: can't use 'keyCode' in $event because Chrome autofill fires fake
        // key events that do not have keyCode property...
        "if(!$event.type.indexOf('key')&&" +
        (keys.map(genFilterCode).join('&&')) + ")return null;"
    )
}

function genFilterCode (key) {
    var keyVal = parseInt(key, 10);
    if (keyVal) {
        return ("$event.keyCode!==" + keyVal)
    }
    var keyCode = keyCodes[key];
    var keyName = keyNames[key];
    return (
        "_k($event.keyCode," +
        (JSON.stringify(key)) + "," +
        (JSON.stringify(keyCode)) + "," +
        "$event.key," +
        "" + (JSON.stringify(keyName)) +
        ")"
    )
}

/*  */

function on (el, dir) {
    if (dir.modifiers) {
        warn("v-on without argument does not support modifiers.");
    }
    el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
}

/*  */

function bind$1 (el, dir) {
    el.wrapData = function (code) {
        return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
    };
}

/*  */

var baseDirectives = {
    on: on,
    bind: bind$1,
    cloak: noop
};

/*  */





var CodegenState = function CodegenState (options) {
    this.options = options;
    this.warn = options.warn || baseWarn;
    this.transforms = pluckModuleFunction(options.modules, 'transformCode');
    this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
    this.directives = extend(extend({}, baseDirectives), options.directives);
    var isReservedTag = options.isReservedTag || no;
    this.maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
    this.onceId = 0;
    this.staticRenderFns = [];
    this.pre = false;
};



function generate (
    ast,
    options
) {
    var state = new CodegenState(options);
    var code = ast ? genElement(ast, state) : '_c("div")';
    return {
        render: ("with(this){return " + code + "}"),
        staticRenderFns: state.staticRenderFns
    }
}

function genElement (el, state) {
    if (el.parent) {
        el.pre = el.pre || el.parent.pre;
    }

    if (el.staticRoot && !el.staticProcessed) {
        return genStatic(el, state)
    } else if (el.once && !el.onceProcessed) {
        return genOnce(el, state)
    } else if (el.for && !el.forProcessed) {
        return genFor(el, state)
    } else if (el.if && !el.ifProcessed) {
        return genIf(el, state)
    } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
        return genChildren(el, state) || 'void 0'
    } else if (el.tag === 'slot') {
        return genSlot(el, state)
    } else {
        // component or element
        var code;
        if (el.component) {
            code = genComponent(el.component, el, state);
        } else {
            var data;
            if (!el.plain || (el.pre && state.maybeComponent(el))) {
                data = genData$2(el, state);
            }

            var children = el.inlineTemplate ? null : genChildren(el, state, true);
            code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
        }
        // module transforms
        for (var i = 0; i < state.transforms.length; i++) {
            code = state.transforms[i](el, code);
        }
        return code
    }
}

// hoist static sub-trees out
function genStatic (el, state) {
    el.staticProcessed = true;
    // Some elements (templates) need to behave differently inside of a v-pre
    // node.  All pre nodes are static roots, so we can use this as a location to
    // wrap a state change and reset it upon exiting the pre node.
    var originalPreState = state.pre;
    if (el.pre) {
        state.pre = el.pre;
    }
    state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
    state.pre = originalPreState;
    return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
}

// v-once
function genOnce (el, state) {
    el.onceProcessed = true;
    if (el.if && !el.ifProcessed) {
        return genIf(el, state)
    } else if (el.staticInFor) {
        var key = '';
        var parent = el.parent;
        while (parent) {
            if (parent.for) {
                key = parent.key;
                break
            }
            parent = parent.parent;
        }
        if (!key) {
            state.warn(
                "v-once can only be used inside v-for that is keyed. ",
                el.rawAttrsMap['v-once']
            );
            return genElement(el, state)
        }
        return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
    } else {
        return genStatic(el, state)
    }
}

function genIf (
    el,
    state,
    altGen,
    altEmpty
) {
    el.ifProcessed = true; // avoid recursion
    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
}

function genIfConditions (
    conditions,
    state,
    altGen,
    altEmpty
) {
    if (!conditions.length) {
        return altEmpty || '_e()'
    }

    var condition = conditions.shift();
    if (condition.exp) {
        return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
    } else {
        return ("" + (genTernaryExp(condition.block)))
    }

    // v-if with v-once should generate code like (a)?_m(0):_m(1)
    function genTernaryExp (el) {
        return altGen
            ? altGen(el, state)
            : el.once
                ? genOnce(el, state)
                : genElement(el, state)
    }
}

function genFor (
    el,
    state,
    altGen,
    altHelper
) {
    var exp = el.for;
    var alias = el.alias;
    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';

    if (state.maybeComponent(el) &&
        el.tag !== 'slot' &&
        el.tag !== 'template' &&
        !el.key
    ) {
        state.warn(
            "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
            "v-for should have explicit keys. " +
            "See https://vuejs.org/guide/list.html#key for more info.",
            el.rawAttrsMap['v-for'],
            true /* tip */
        );
    }

    el.forProcessed = true; // avoid recursion
    return (altHelper || '_l') + "((" + exp + ")," +
        "function(" + alias + iterator1 + iterator2 + "){" +
        "return " + ((altGen || genElement)(el, state)) +
        '})'
}

function genData$2 (el, state) {
    var data = '{';

    // directives first.
    // directives may mutate the el's other properties before they are generated.
    var dirs = genDirectives(el, state);
    if (dirs) { data += dirs + ','; }

    // key
    if (el.key) {
        data += "key:" + (el.key) + ",";
    }
    // ref
    if (el.ref) {
        data += "ref:" + (el.ref) + ",";
    }
    if (el.refInFor) {
        data += "refInFor:true,";
    }
    // pre
    if (el.pre) {
        data += "pre:true,";
    }
    // record original tag name for components using "is" attribute
    if (el.component) {
        data += "tag:\"" + (el.tag) + "\",";
    }
    // module data generation functions
    for (var i = 0; i < state.dataGenFns.length; i++) {
        data += state.dataGenFns[i](el);
    }
    // attributes
    if (el.attrs) {
        data += "attrs:" + (genProps(el.attrs)) + ",";
    }
    // DOM props
    if (el.props) {
        data += "domProps:" + (genProps(el.props)) + ",";
    }
    // event handlers
    if (el.events) {
        data += (genHandlers(el.events, false)) + ",";
    }
    if (el.nativeEvents) {
        data += (genHandlers(el.nativeEvents, true)) + ",";
    }
    // slot target
    // only for non-scoped slots
    if (el.slotTarget && !el.slotScope) {
        data += "slot:" + (el.slotTarget) + ",";
    }
    // scoped slots
    if (el.scopedSlots) {
        data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
    }
    // component v-model
    if (el.model) {
        data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
    }
    // inline-template
    if (el.inlineTemplate) {
        var inlineTemplate = genInlineTemplate(el, state);
        if (inlineTemplate) {
            data += inlineTemplate + ",";
        }
    }
    data = data.replace(/,$/, '') + '}';
    // v-bind dynamic argument wrap
    // v-bind with dynamic arguments must be applied using the same v-bind object
    // merge helper so that class/style/mustUseProp attrs are handled correctly.
    if (el.dynamicAttrs) {
        data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
    }
    // v-bind data wrap
    if (el.wrapData) {
        data = el.wrapData(data);
    }
    // v-on data wrap
    if (el.wrapListeners) {
        data = el.wrapListeners(data);
    }
    return data
}

function genDirectives (el, state) {
    var dirs = el.directives;
    if (!dirs) { return }
    var res = 'directives:[';
    var hasRuntime = false;
    var i, l, dir, needRuntime;
    for (i = 0, l = dirs.length; i < l; i++) {
        dir = dirs[i];
        needRuntime = true;
        var gen = state.directives[dir.name];
        if (gen) {
            // compile-time directive that manipulates AST.
            // returns true if it also needs a runtime counterpart.
            needRuntime = !!gen(el, dir, state.warn);
        }
        if (needRuntime) {
            hasRuntime = true;
            res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
        }
    }
    if (hasRuntime) {
        return res.slice(0, -1) + ']'
    }
}

function genInlineTemplate (el, state) {
    var ast = el.children[0];
    if (el.children.length !== 1 || ast.type !== 1) {
        state.warn(
            'Inline-template components must have exactly one child element.',
            { start: el.start }
        );
    }
    if (ast && ast.type === 1) {
        var inlineRenderFns = generate(ast, state.options);
        return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
    }
}

function genScopedSlots (
    el,
    slots,
    state
) {
    // by default scoped slots are considered "stable", this allows child
    // components with only scoped slots to skip forced updates from parent.
    // but in some cases we have to bail-out of this optimization
    // for example if the slot contains dynamic names, has v-if or v-for on them...
    var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
        var slot = slots[key];
        return (
            slot.slotTargetDynamic ||
            slot.if ||
            slot.for ||
            containsSlotChild(slot) // is passing down slot from parent which may be dynamic
        )
    });

    // #9534: if a component with scoped slots is inside a conditional branch,
    // it's possible for the same component to be reused but with different
    // compiled slot content. To avoid that, we generate a unique key based on
    // the generated code of all the slot contents.
    var needsKey = !!el.if;

    // OR when it is inside another scoped slot or v-for (the reactivity may be
    // disconnected due to the intermediate scope variable)
    // #9438, #9506
    // TODO: this can be further optimized by properly analyzing in-scope bindings
    // and skip force updating ones that do not actually use scope variables.
    if (!needsForceUpdate) {
        var parent = el.parent;
        while (parent) {
            if (
                (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
                parent.for
            ) {
                needsForceUpdate = true;
                break
            }
            if (parent.if) {
                needsKey = true;
            }
            parent = parent.parent;
        }
    }

    var generatedSlots = Object.keys(slots)
        .map(function (key) { return genScopedSlot(slots[key], state); })
        .join(',');

    return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,false," + (hash(generatedSlots))) : "") + ")")
}

function hash(str) {
    var hash = 5381;
    var i = str.length;
    while(i) {
        hash = (hash * 33) ^ str.charCodeAt(--i);
    }
    return hash >>> 0
}

function containsSlotChild (el) {
    if (el.type === 1) {
        if (el.tag === 'slot') {
            return true
        }
        return el.children.some(containsSlotChild)
    }
    return false
}

function genScopedSlot (
    el,
    state
) {
    var isLegacySyntax = el.attrsMap['slot-scope'];
    if (el.if && !el.ifProcessed && !isLegacySyntax) {
        return genIf(el, state, genScopedSlot, "null")
    }
    if (el.for && !el.forProcessed) {
        return genFor(el, state, genScopedSlot)
    }
    var slotScope = el.slotScope === emptySlotScopeToken
        ? ""
        : String(el.slotScope);
    var fn = "function(" + slotScope + "){" +
        "return " + (el.tag === 'template'
            ? el.if && isLegacySyntax
                ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
                : genChildren(el, state) || 'undefined'
            : genElement(el, state)) + "}";
    // reverse proxy v-slot without scope on this.$slots
    var reverseProxy = slotScope ? "" : ",proxy:true";
    return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
}

function genChildren (
    el,
    state,
    checkSkip,
    altGenElement,
    altGenNode
) {
    var children = el.children;
    if (children.length) {
        var el$1 = children[0];
        // optimize single v-for
        if (children.length === 1 &&
            el$1.for &&
            el$1.tag !== 'template' &&
            el$1.tag !== 'slot'
        ) {
            var normalizationType = checkSkip
                ? state.maybeComponent(el$1) ? ",1" : ",0"
                : "";
            return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
        }
        var normalizationType$1 = checkSkip
            ? getNormalizationType(children, state.maybeComponent)
            : 0;
        var gen = altGenNode || genNode;
        return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
    }
}

// determine the normalization needed for the children array.
// 0: no normalization needed
// 1: simple normalization needed (possible 1-level deep nested array)
// 2: full normalization needed
function getNormalizationType (
    children,
    maybeComponent
) {
    var res = 0;
    for (var i = 0; i < children.length; i++) {
        var el = children[i];
        if (el.type !== 1) {
            continue
        }
        if (needsNormalization(el) ||
            (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
            res = 2;
            break
        }
        if (maybeComponent(el) ||
            (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
            res = 1;
        }
    }
    return res
}

function needsNormalization (el) {
    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
}

function genNode (node, state) {
    if (node.type === 1) {
        return genElement(node, state)
    } else if (node.type === 3 && node.isComment) {
        return genComment(node)
    } else {
        return genText(node)
    }
}

function genText (text) {
    return ("_v(" + (text.type === 2
        ? text.expression // no need for () because already wrapped in _s()
        : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
}

function genComment (comment) {
    return ("_e(" + (JSON.stringify(comment.text)) + ")")
}

function genSlot (el, state) {
    var slotName = el.slotName || '"default"';
    var children = genChildren(el, state);
    var res = "_t(" + slotName + (children ? ("," + children) : '');
    var attrs = el.attrs || el.dynamicAttrs
        ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
            // slot props are camelized
            name: camelize(attr.name),
            value: attr.value,
            dynamic: attr.dynamic
        }); }))
        : null;
    var bind$$1 = el.attrsMap['v-bind'];
    if ((attrs || bind$$1) && !children) {
        res += ",null";
    }
    if (attrs) {
        res += "," + attrs;
    }
    if (bind$$1) {
        res += (attrs ? '' : ',null') + "," + bind$$1;
    }
    return res + ')'
}

// componentName is el.component, take it as argument to shun flow's pessimistic refinement
function genComponent (
    componentName,
    el,
    state
) {
    var children = el.inlineTemplate ? null : genChildren(el, state, true);
    return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
}

function genProps (props) {
    var staticProps = "";
    var dynamicProps = "";
    for (var i = 0; i < props.length; i++) {
        var prop = props[i];
        var value = transformSpecialNewlines(prop.value);
        if (prop.dynamic) {
            dynamicProps += (prop.name) + "," + value + ",";
        } else {
            staticProps += "\"" + (prop.name) + "\":" + value + ",";
        }
    }
    staticProps = "{" + (staticProps.slice(0, -1)) + "}";
    if (dynamicProps) {
        return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
    } else {
        return staticProps
    }
}

// #3895, #4268
function transformSpecialNewlines (text) {
    return text
        .replace(/\u2028/g, '\\u2028')
        .replace(/\u2029/g, '\\u2029')
}

/*  */



// these keywords should not appear inside expressions, but operators like
// typeof, instanceof and in are allowed
var prohibitedKeywordRE = new RegExp('\\b' + (
    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
    'super,throw,while,yield,delete,export,import,return,switch,default,' +
    'extends,finally,continue,debugger,function,arguments'
).split(',').join('\\b|\\b') + '\\b');

// these unary operators should not be used as property/method names
var unaryOperatorsRE = new RegExp('\\b' + (
    'delete,typeof,void'
).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

// strip strings in expressions
var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

// detect problematic expressions in a template
function detectErrors (ast, warn) {
    if (ast) {
        checkNode(ast, warn);
    }
}

function checkNode (node, warn) {
    if (node.type === 1) {
        for (var name in node.attrsMap) {
            if (dirRE.test(name)) {
                var value = node.attrsMap[name];
                if (value) {
                    var range = node.rawAttrsMap[name];
                    if (name === 'v-for') {
                        checkFor(node, ("v-for=\"" + value + "\""), warn, range);
                    } else if (onRE.test(name)) {
                        checkEvent(value, (name + "=\"" + value + "\""), warn, range);
                    } else {
                        checkExpression(value, (name + "=\"" + value + "\""), warn, range);
                    }
                }
            }
        }
        if (node.children) {
            for (var i = 0; i < node.children.length; i++) {
                checkNode(node.children[i], warn);
            }
        }
    } else if (node.type === 2) {
        checkExpression(node.expression, node.text, warn, node);
    }
}

function checkEvent (exp, text, warn, range) {
    var stipped = exp.replace(stripStringRE, '');
    var keywordMatch = stipped.match(unaryOperatorsRE);
    if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
        warn(
            "avoid using JavaScript unary operator as property name: " +
            "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
            range
        );
    }
    checkExpression(exp, text, warn, range);
}

function checkFor (node, text, warn, range) {
    checkExpression(node.for || '', text, warn, range);
    checkIdentifier(node.alias, 'v-for alias', text, warn, range);
    checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
    checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
}

function checkIdentifier (
    ident,
    type,
    text,
    warn,
    range
) {
    if (typeof ident === 'string') {
        try {
            new Function(("var " + ident + "=_"));
        } catch (e) {
            warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
        }
    }
}

function checkExpression (exp, text, warn, range) {
    try {
        new Function(("return " + exp));
    } catch (e) {
        var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
        if (keywordMatch) {
            warn(
                "avoid using JavaScript keyword as property name: " +
                "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
                range
            );
        } else {
            warn(
                "invalid expression: " + (e.message) + " in\n\n" +
                "    " + exp + "\n\n" +
                "  Raw expression: " + (text.trim()) + "\n",
                range
            );
        }
    }
}

/*  */

var range = 2;

function generateCodeFrame (
    source,
    start,
    end
) {
    if ( start === void 0 ) start = 0;
    if ( end === void 0 ) end = source.length;

    var lines = source.split(/\r?\n/);
    var count = 0;
    var res = [];
    for (var i = 0; i < lines.length; i++) {
        count += lines[i].length + 1;
        if (count >= start) {
            for (var j = i - range; j <= i + range || end > count; j++) {
                if (j < 0 || j >= lines.length) { continue }
                res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
                var lineLength = lines[j].length;
                if (j === i) {
                    // push underline
                    var pad = start - (count - lineLength) + 1;
                    var length = end > count ? lineLength - pad : end - start;
                    res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
                } else if (j > i) {
                    if (end > count) {
                        var length$1 = Math.min(end - count, lineLength);
                        res.push("   |  " + repeat$1("^", length$1));
                    }
                    count += lineLength + 1;
                }
            }
            break
        }
    }
    return res.join('\n')
}

function repeat$1 (str, n) {
    var result = '';
    if (n > 0) {
        while (true) { // eslint-disable-line
            if (n & 1) { result += str; }
            n >>>= 1;
            if (n <= 0) { break }
            str += str;
        }
    }
    return result
}

/*  */



function createFunction (code, errors) {
    try {
        return new Function(code)
    } catch (err) {
        errors.push({ err: err, code: code });
        return noop
    }
}

function createCompileToFunctionFn (compile) {
    var cache = Object.create(null);

    return function compileToFunctions (
        template,
        options,
        vm
    ) {
        options = extend({}, options);
        var warn$$1 = options.warn || warn;
        delete options.warn;

        /* istanbul ignore if */
        {
            // detect possible CSP restriction
            try {
                new Function('return 1');
            } catch (e) {
                if (e.toString().match(/unsafe-eval|CSP/)) {
                    warn$$1(
                        'It seems you are using the standalone build of Vue.js in an ' +
                        'environment with Content Security Policy that prohibits unsafe-eval. ' +
                        'The template compiler cannot work in this environment. Consider ' +
                        'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                        'templates into render functions.'
                    );
                }
            }
        }

        // check cache
        var key = options.delimiters
            ? String(options.delimiters) + template
            : template;
        if (cache[key]) {
            return cache[key]
        }

        // compile
        var compiled = compile(template, options);

        // check compilation errors/tips
        {
            if (compiled.errors && compiled.errors.length) {
                if (options.outputSourceRange) {
                    compiled.errors.forEach(function (e) {
                        warn$$1(
                            "Error compiling template:\n\n" + (e.msg) + "\n\n" +
                            generateCodeFrame(template, e.start, e.end),
                            vm
                        );
                    });
                } else {
                    warn$$1(
                        "Error compiling template:\n\n" + template + "\n\n" +
                        compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
                        vm
                    );
                }
            }
            if (compiled.tips && compiled.tips.length) {
                if (options.outputSourceRange) {
                    compiled.tips.forEach(function (e) { return tip(e.msg, vm); });
                } else {
                    compiled.tips.forEach(function (msg) { return tip(msg, vm); });
                }
            }
        }

        // turn code into functions
        var res = {};
        var fnGenErrors = [];
        res.render = createFunction(compiled.render, fnGenErrors);
        res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
            return createFunction(code, fnGenErrors)
        });

        // check function generation errors.
        // this should only happen if there is a bug in the compiler itself.
        // mostly for codegen development use
        /* istanbul ignore if */
        {
            if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                warn$$1(
                    "Failed to generate render function:\n\n" +
                    fnGenErrors.map(function (ref) {
                        var err = ref.err;
                        var code = ref.code;

                        return ((err.toString()) + " in\n\n" + code + "\n");
                    }).join('\n'),
                    vm
                );
            }
        }

        return (cache[key] = res)
    }
}

/*  */

function createCompilerCreator (baseCompile) {
    return function createCompiler (baseOptions) {
        function compile (
            template,
            options
        ) {
            var finalOptions = Object.create(baseOptions);
            var errors = [];
            var tips = [];

            var warn = function (msg, range, tip) {
                (tip ? tips : errors).push(msg);
            };

            if (options) {
                if (options.outputSourceRange) {
                    // $flow-disable-line
                    var leadingSpaceLength = template.match(/^\s*/)[0].length;

                    warn = function (msg, range, tip) {
                        var data = { msg: msg };
                        if (range) {
                            if (range.start != null) {
                                data.start = range.start + leadingSpaceLength;
                            }
                            if (range.end != null) {
                                data.end = range.end + leadingSpaceLength;
                            }
                        }
                        (tip ? tips : errors).push(data);
                    };
                }
                // merge custom modules
                if (options.modules) {
                    finalOptions.modules =
                        (baseOptions.modules || []).concat(options.modules);
                }
                // merge custom directives
                if (options.directives) {
                    finalOptions.directives = extend(
                        Object.create(baseOptions.directives || null),
                        options.directives
                    );
                }
                // copy other options
                for (var key in options) {
                    if (key !== 'modules' && key !== 'directives') {
                        finalOptions[key] = options[key];
                    }
                }
            }

            finalOptions.warn = warn;

            var compiled = baseCompile(template.trim(), finalOptions);
            {
                detectErrors(compiled.ast, warn);
            }
            compiled.errors = errors;
            compiled.tips = tips;
            return compiled
        }

        return {
            compile: compile,
            compileToFunctions: createCompileToFunctionFn(compile)
        }
    }
}

/*  */

// `createCompilerCreator` allows creating compilers that use alternative
// parser/optimizer/codegen, e.g the SSR optimizing compiler.
// Here we just export a default compiler using the default parts.
var createCompiler = createCompilerCreator(function baseCompile (
    template,
    options
) {
    var ast = parse(template.trim(), options);
    if (options.optimize !== false) {
        optimize(ast, options);
    }
    var code = generate(ast, options);
    return {
        ast: ast,
        render: code.render,
        staticRenderFns: code.staticRenderFns
    }
});

/*  */

var ref$1 = createCompiler(baseOptions);
var compile = ref$1.compile;
var compileToFunctions = ref$1.compileToFunctions;

/*  */

// check whether current browser encodes a char inside attribute values
var div;
function getShouldDecode (href) {
    div = div || document.createElement('div');
    div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
    return div.innerHTML.indexOf('&#10;') > 0
}

// #3663: IE encodes newlines inside attribute values while other browsers don't
var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
// #6828: chrome encodes content in a[href]
var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;

/*  */

var idToTemplate = cached(function (id) {
    var el = query(id);
    return el && el.innerHTML
});

var mount = Vue.prototype.$mount;
Vue.prototype.$mount = function (
    el,
    hydrating
) {
    el = el && query(el);

    /* istanbul ignore if */
    if (el === document.body || el === document.documentElement) {
        warn(
            "Do not mount Vue to <html> or <body> - mount to normal elements instead."
        );
        return this
    }

    var options = this.$options;
    // resolve template/el and convert to render function
    if (!options.render) {
        var template = options.template;
        if (template) {
            if (typeof template === 'string') {
                if (template.charAt(0) === '#') {
                    template = idToTemplate(template);
                    /* istanbul ignore if */
                    if (!template) {
                        warn(
                            ("Template element not found or is empty: " + (options.template)),
                            this
                        );
                    }
                }
            } else if (template.nodeType) {
                template = template.innerHTML;
            } else {
                {
                    warn('invalid template option:' + template, this);
                }
                return this
            }
        } else if (el) {
            template = getOuterHTML(el);
        }
        if (template) {
            /* istanbul ignore if */
            if (config.performance && mark) {
                mark('compile');
            }

            var ref = compileToFunctions(template, {
                outputSourceRange: "development" !== 'production',
                shouldDecodeNewlines: shouldDecodeNewlines,
                shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
                delimiters: options.delimiters,
                comments: options.comments
            }, this);
            var render = ref.render;
            var staticRenderFns = ref.staticRenderFns;
            options.render = render;
            options.staticRenderFns = staticRenderFns;

            /* istanbul ignore if */
            if (config.performance && mark) {
                mark('compile end');
                measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
            }
        }
    }
    return mount.call(this, el, hydrating)
};

/**
 * Get outerHTML of elements, taking care
 * of SVG elements in IE as well.
 */
function getOuterHTML (el) {
    if (el.outerHTML) {
        return el.outerHTML
    } else {
        var container = document.createElement('div');
        container.appendChild(el.cloneNode(true));
        return container.innerHTML
    }
}

Vue.compile = compileToFunctions;

module.exports = Vue;
